(完整版)《复变函数与积分变换》习题册(2)

第一章 复数与复变函数

本章知识点和基本要求

掌握复数的概念和它的各种表示方法及运算； 熟悉复平面、模与辐角的概念；

熟练掌握乘积与商的模、隶莫弗公式、方根运算公式； 了解区域的概念；理解复变函数的概念； 理解复变函数的极限和连续的概念。

一、填空题

1、若等式))(()75(i y i x i i -+=-成立，则=x ______, =y _______.

2、设(12)(35)13i x i y i ++-=-，则x = ，y =

3、若1231i

z i i

+=--，则z =

4、若(3)(25)

2i i z i

+-=

，则Re z =

5、若4

21i

z i i

+=-

+，则z = 6、设(2)(2)z i i =+-+，则arg z =

7复数1z i =-的三角表示式为 ，指数表示式为 。 8、复数i z 212--=的三角表示式为 _________________，指数表示式为

_________________.

9、设i z 21=,i z -=12，则)(21z z Arg = _ _____.

10、设4

i e 2z π=,则Rez=____________. Im()z = 。z = 11、.方程0273=+z 的根为_________________________________.

12、一曲线的复数方程是2z i -=，则此曲线的直角坐标方程

为 。

13、方程3)Im(=-z i 表示的曲线是__________________________. 14、复变函数1

2

+-=

z z w 的实部=),(y x u _________,虚部=),(y x v _________. 15、不等式114z z -++<所表示的区域是曲线 的内部。

16

二、判断题（正确打√，错误打?）

1、复数7613i i +>+. ( )

2、若z 为纯虚数，则z z ≠. ( )

3、若 a 为实常数，则a a = （ ）

4、复数0的辐角为0.

5、()f z u iv =+在000iy x z +=点连续的充分必要条件是(,),(,)u x y v x y 在

00(,)x y 点连续。 （ ）

6、设21,z z 为复数，则2121z z z z ?=。 （ ）

7、1212z z z z +=+ （ ）

8、参数方程2

z t ti =+ （t 为实参数）所表示的曲线是抛物线2y x =. ( )

三、单项选择题

1、下列等式中，对任意复数z 都成立的等式是 （ ） A.z·z =Re(z·z ) B. z·z =Im(z·z ) C. z·z =arg (z·z )

D. z·z =|z|

2、方程3z =8 的复根的个数为 （ ）

A. 3个

B. 1个

C. 2个

D. 0个

3、当11i

z i

+=-时，1007550z z z ++的值等于 （ ）

A i

B i -

C 1

D 1-

4、方程23z i +-= （ ）

A 中心为23i -的圆周

B 中心为23i -+，半径为2的圆周

C 中心为23i -+的圆周

D 中心为23i -，半径为2的圆周

四、计算题

1．求出复数4)31(i z +-=的模和辐角。

2．设iy x z +=满足,4)3Re(2

=+z 求x 与y 的关系式

3、将复数6z i =化为三角表示式和指数表示式。

4、求复数1cos sin ,(0)i j j j p -+＃的三角表示式、指数表示式及幅角主值。

5．将直线方程1

+y

x化为复数形式。

2=

3

6、求以下根式的值：

（1）(2) (3)

第二章 解析函数

本章知识点和基本要求

理解复变函数的导数及复变函数解析的概念；

掌握复变函数解析的C-R 条件，并能利用C-R 条件判断复变函数的可导性和解析性；

掌握解析函数的基本性质；

了解指数函数、三角函数及对数函数的定义及它们的主要性质。

一、填空题

1、(1)Ln i +的主值为

2、()Ln i -= ，主值为

3、设i e z 43+-= , 则=)Re(iz _________________

4、=i 3_____________________________.

5、=+i i )1(________________________.

6、1i i +=

7、指数函数z e 的周期是

8、设()(1)z f z z e -=-，则()f z '=

9、设3322()f z x y ix y =++，则(1)f i '+=

10、已知函数()(21)(,)f z x y v x y i =++解析，则()f i ￠

= 11、.函数()f z u iv =+在000z x iy =+点连续是()f z 在该点解析的_________条件。

二、判断题（正确打√，错误打?）

1、.若)(z f '在区域D 内处处为零，则)(z f 在D 内必恒为常数。 （ ）

2、.若()f z 在0z 点不解析，则()f z 在0z 点必不可导。 （ ）

3、函数()(,)(,)f z u x y iv x y =+在点000z x iy =+可微等价于(,)(,)u x y v x y 和在点

00(,)x y 可微。 （ ）

4、sin 1z ≤.. （ ）

5、函数z e 是周期函数。 （ ）

6、设函数()f z 在点0z 处可导，则()f z 在点0z 处解析。 （ ）

7、对于任意的复数12,z z ，等式1212(.)Ln z z Lnz Lnz =+恒成立。 （ ）

8、不等式Re()2z ≤ 表示的是有界闭区域。 （ ）

9、对于任意的复数z ，整数n ，等式n Lnz nLnz =恒成立 （ ）

三、单项选择题

1、下列点集是单连域的是 （ ）

A ．Re()2z > B.13z

C.1z ￡

D.2arg 2Z p ＃+

2、下列所示区域中是多连域的为 （ ） A.Im 0z > B.Re 0z < C.01z << D.

arg 4

3

z π

π

<<

3、函数()f z 在点z 可导是()f z 在点z 解析的 （ ）

A ．充分不必要条件 B.必要不充分条件

C. 充分必要条件

D.既不充分又不必要条件 4、下列说法正确的是 （ ）

A 、()f z 在0z 可导的充要条件是()f z 在0z 处解析。

B 、()f z 在0z 可导的充要条件是 ,u v 在0z 处偏导数连续且满足

C R -条件。 C 、()f z 在0z 可导的充要条件是()f z 在0z 处连续。

D 、()f z 在0z 可导的充要条件是,u v 在0z 处可微且满足C R -条件

5、在复平面上，下列关于正弦函数sinz 的命题中，错误的是（ ） A.sinz 是周期函数 B.sinz 是解析函数 C.|sinz|1≤

D.(sin )cos z z '=

6、以下说法中，错误的是 （ ）

A ．复指数函数z e 具有周期 B.幂函数a z (a 为非零的复常数)是多值函数 C ．对数函数Lnz 为多值函数 D.在复数域内sin z 和cos z 都是有界函数 7、设()sin f z z =，则下列命题中错误的是（

）。

A ．()f z 在复平面内处处解析

B ．()f z 以2π为周期

C ．()2

iz iz e e f z --= D ．()f z 是无界的

四、计算题

判断下列函数在何处可导，在何处解析？ (1)33()23f z x y i =+

(2)2()()2()f z x y x y i =-++

(3) 22()f z xy ix y =+

第三章 复变函数的积分

本章知识点和基本要求

了解复变函数积分的定义及性质； 会求复变函数的积分；

理解柯西积分定理，掌握柯西积分公式；0 掌握解析函数的高阶导数公式；

了解解析函数无限次可导的性质；会综合利用各定理计算闭路积分。

一、填空题

1、设曲线C 是正向圆周2z =，则1

1C

dz z =-?? ，21(1)C dz z =-?? ，2

(1)

z

C

e dz z =-?? 。

2、设C 为从点1z i =-到点20z =的直线段，则C

zdz =?_______.

3、若C 为正向圆周2z =，则1

C dz z =??________.

4、若22

21

()z z z f dz z ξξ=++=-??，2ξ≠，则(35)f i +=__ ___,(1)f = . (1)f '=

5、(:4)3

z c e dz c z z =-??的值是________ 二、单项选择题

1、若f(z)在D 内解析，()z Φ为f(z)的一个原函数，则（ ） A.()()f z z '=Φ B. ()()f z z ''=Φ C.()()z f z 'Φ=

D. ()()z f z ''Φ=

2、下列积分中，积分值不为0的是 （ ）

A.3(2)C

z z dz +?? ，12z -= B.z

c

e dz ?? ，2z = C.sin c z dz z ??，1z = D.cos 1c

z

dz z -??，2z = 三、计算题

1、沿下列路径计算积分C

zdz ?

(1) 从原点到3i +的直线段

(2) 从原点沿实轴到3，再从3垂直向上到3i +。

2、沿下列路径计算积分2C

z dz ?

(1)从原点到1i +的直线段

(2)从原点沿实轴到1，再从1垂直向上到1i +。

3、计算0

cos i zdz ?。 4、计算积分30

(23).i

z dz +-?

5、2()C

x y ix dz -+?，其中C 是从点0到1i +的直线段。

6、设C 为从-2到2的上半圆周，计算积分23

C z dz z

-?的值。

7、21

1

C

dz z -?

?，C 为正向圆周2z =

8、计算积分()(4)

C dz

z i z -+??，其中C 为圆周3Z =，且取正向。

9、计算212(1)(2)

C z i

dz z z i ++++?

?，其中C 为正向圆周3z =.

10、求下列积分之值（积分沿闭曲线的正向）

（1） 1

(2)c z dz z z --??，3z = （2） ()(2)

2

c

dz

i

z z -+?

?，1z =

（3） 3cos c z

dz z ??，1z = (4) 3()iz

c e dz z i -??，1z i -=

第七章 傅里叶变换

本章知识点和基本要求

掌握傅氏积分定理、理解傅氏积分公式； 理解傅立叶变换及傅立叶逆变换的概念； 了解δ函数的概念、性质及其傅氏变换， 了解傅氏变换的物理意义；

掌握傅氏变换的性质，熟悉常用傅氏变换对。

一、填空题

1、设50 ,0(),0

t t f t e t -ì

(), t 0t t f t e β-

3、[1]_______F =

4、设1

[()]F f t i αω

=

+，则()f t = ； 5、设2()sin f t t =，则[()]F f t = ；

6、设[()]()F f t F w =，则[(5)()]F t f t += ；

7、设[()]()F f t F ω=，0t 为实常数，则0[()]F f t t -= ； 8、0[()]F t t δ-= ；

9、设[()]()F f t F w =，则(1)f t -的傅氏变换[(1)]F f t -= ； 10、[()]()F f t F ω=，则[()]_______t F f d ττ-∞

=?

11、已知()f t t =，且2

2

[()]F f t ω=-

，则12

2

[](2)

F ω--

=- 二、单项选择题

1、下列变换中，正确的是 ( )

A.[()]1F t δ=

B. [1]()F δω=

C. 1[()]1F δω-=

D. 1[1]()F u t -= 2、设[()]()F f t F ω=，则[(1)()]F t f t -为 ( )

A. ()()iF F ωω'+

B. ()()iF F ωω'-

C. ()()iF F ωω'-+

D. ()()iF F ωω'-- 3、()0t t δ-的傅里叶变换[]0()F t t δ-为 （ ）

A ．1

B 。0t

C 。0

i t e

ω- D 。0

i t e

ω

4、设[()]()F f t F ω=，则[(23)()]F t f t -= （ ）

A.2()3()iF F ωω'-

B. 2()3()iF F ωω'+

C. 2()3()iF F ωω'-+

D. 2()3()iF F ωω'-- 5、设[()]()F f t F ω=，则[(2)()]F t f t -= （ ）

A.()2()F F ωω'-

B. ()2()F F ωω'--

C. ()2()iF F ωω'-

D. ()2()iF F ωω'-- 6、设0()cos f t t ω=，则[()]F f t = （ ）

A.00[()()]πδωωδωω++-

B. 00[()()]πδωωδωω+--

C.00[()()]i πδωωδωω+--

D. 00[()()]i πδωωδωω++- 7、设0()(2)i t f t t e ωδ=-+，则[()]F f t = （ ）

A 202()i e ωπδωω-+-

B 202()i e ωπδωω+-

C 202()i e ωπδωω-++

D 202()i e ωπδωω++ 8、设0()sin f t t ω=，则其傅氏变换[()]F f t = （ ）

A.00[()()]δωωδωω+--

B. 00[()()]i πδωωδωω+--

C.00[()()]πδωωδωω+--

D. 00[()()]i πδωωδωω++-

三、计算题

1、已知函数0,12,10()1,020,2t t f t t t -∞<<-??-≤

=?≤

?，求它的傅里叶变换。

2、求函数2,10() 2, 01 0, t f t t --<<=<<ì???

í?????其他的傅里叶变换；

3、求函数0,0

()0t t f t e t β- ）的傅氏变换及其积分表达式。

4、求函数 sin ()0t t f t t π

π? ≤?=? ,>??

的傅氏变换，

并证明2

sin ,sin sin 210,t t t d t π

π

ωπωωωπ+∞

?≤?=?-?≥?

?；

5、利用定义或查表求下列函数的傅里叶逆变换

（1）00()[()()]555i F p w w

w d w d w =+--

（2）00()[()()]555

F p w w

w d w d w =++-

6、用傅里叶变换求解下面的微分方程

()()(),x t x t t t δ'+=-∞<<+∞

7、设[()]()F f t F ω=，列表给出下列函数的付里叶变换：

2

00'(),"(),(),(),(),()f t f t tf t t f t f t t f t t -+，(),()t

f d f at ττ-∞

?

001,(),(),(),t t t t t δδδ-+ 0,0

(),0t t f t e t β-

并证明付里叶变换的微分性质和位移性质。

第八章 拉普拉斯变换

本章知识点和基本要求

理解拉普拉斯变换及拉普拉斯逆变换的概念； 了解拉普拉斯变换存在定理； 掌握拉普拉斯变换的性质； 掌握用留数求拉氏逆变换的方法； 了解拉氏变换卷积概念及卷积定理；

应用拉氏变换求解常微分方程及常微分方程组。

一、填空题

1、设2

1()F S S

=

，则[()]S

L e F S --1= 2、[(sin 3)]L t ￠

= 3、[sin ]t L e t =

4、设()(35)f t u t =-，3[()]t L e f t -=

5、[cos ]t L e t =

6、设2

2[()],4

L f t s =

+ 则 3[()]t

L e f t -= 7、设2()(1)t f t t e =-，[()]L f t = 8、设 22

1()(1)

F s s =

+，则1

[()]L F s -= 9、设11[()](), L f t F S =22[()]()F f t F S =，则12[()*()]L f t f t = 10、设 2

2()16

s F s s +=

+，则1

[()]L F s -= 二、单项选择题

1、下列变换中，不正确的是 ( )

A.[()]1F t δ=

B.[()]1L t δ=

C. [1]()L t δ=

D. [1]2()F πδω= 2、设[()]()L f t F s =，其中正确的是（ ）

A ．[()]()L f t sF s '=

B 。[()]()at L e f t F s a =+

C ．1

[()]()L f at F s a

=

D 。[()]()at L e f t F s a =- 3、()(0)at f t te a => 的拉氏变换为 （ ） A.

1S a - B.1

s a

-- C.21()s a - D.2

1()s a -- 4、若2

1()1

S

F S e S -=

+，则1[()]L F S -= （ ） A.sin(1)t - B.(1)sin u t t - C. ()sin(1)u t t - D.(1)sin(1)u t t -- 5、设2()cos3t f t e t -= 则[()]L f t = （ ） A.

23(2)9S ++ B.2

2

(2)9S S +++ C.

23(2)9S S ++ D. 23(2)

(2)9

S S +++

6、函数2

2()1

s F s s =+ 的拉氏逆变换为 （ ）

A.()cos t t δ

B.()cos t t δ-

C.()(1sin )t t δ-

D.()sin t t δ-

7、设()(2)

S

e F s S S -=+，则1[()]L F S -= （ ）

A 2(1)(1)t e u t ---

B 2(1)(1)(1)t u t e u t ----- C

2(1)1[1](1)2t e u t ---- D 2(1)1

[()(1)]2

t u t e u t ---- 三、计算题

1、利用定义或查表求下列函数的拉普拉斯变换。

(1) 2()sin at f t e t = （2）2()cos 5

t

f t =

(3)()2sin sin f t at t at =- (4) 25()3t t f t e e =+

(5)2()5()t f t e t δ=+ (6)2()t t f t e te =+

(7)()sin at f t e t = （8）2()sin 2f t t =

（9） ()cos f t t at = （10）2()(2)t f t t e =-

（11）()sin (2)f t t u t =?- （12）()sin(2) f t t =-

（13）()sin 2t f t te t -= （14）()sin(2)(2)f t t u t =-?-

2、已知10 ,0

()sin ,0

t f t t t ì

?3??，20 ,0()cos ,0

t f t t t ì

?3??，求1()f t 与2()f t 的卷积12()()f t f t *.

3、用定义或查表求下列函数的拉普拉斯逆变换。

(1) 1

()(1)

F S S S =+ (2) 52()1S e F S S -=+

(3) ()()()b F S S a S b =-- (4)1

()(1)

F S S S =-

(5)3

()(2)(3)S F S S S +=+- (6)22()1

S F S S =+

(7)223

()9

s F s s +=+ (8)4()(4)(2)F s s s =++

(9)22

21

()(1)s s F s s s +-=-

直放站题库

直放站与室内分布系统原理 一、单选题 1.当 C (1分)的施主基站载波扩容时，应相应对其直放站 进行扩容。 A.宽带直放站 B.频带选频直放站 C.载波选频直放站 D.上述 都不用 2.要求直放站的带内平坦度（峰峰值）小于 B (1分) A.2db B.3db C.4db D.6db 3.对于载波选频直放站，在频谱仪上读出输出信号中心频率信号强度下 降 A (1分)dB的频点f1和f2即为其实际工作频带的上下截至频率。 A.1 B.2 C.3 D.4 4.直放站到达施主基站（CDU端）的噪声电平小于(1 分)dBm, A.-36 B.-94 C.-110 D.-120 5.直放站验收规范要求在900MHz频段带内所有互调均小 于 B (1分)dBm。 A.-30 B.-36 C.-33 D.-40 6.直放站系统中覆盖天线与施主天线之间的隔离度应大于直放站实际工作 增益加上 C (1分)dB的冗余储备。 A.3 B.5 C.10 D.15 7.100mW等于 C (1分)dbm。 A.40 B.33 C.20 8.(1分)没有信号放大功 能。 A.直放机 B.有源天线 C.耦合器 D.干线放大器 9.你对天线的增益（dBd）是如何认识的？ C (1分) A.这是一个绝对增益值。 B.天线是无源器件，不可能有增益，所以 此值没有实际意义。 C.这是一个与集中幅射有关的相对值。 D.全向天线没有增益，而定向天线才有增益。 10.以下关于直放站施主天线的描述，哪个是正确 的？ D (1分)

A.位置越高越好 B.位置越低越好 C.尽量使用全向天线 D.尽 量使用方向性好的天线 11. (1分) A.在2f1-f2处测量 B.在2f2-f1处测量 C.在(f1+f2)/2处测 量 D.A和B 12.室内天线的发射功率不大于： B (1分) A.–13dBm/载波 B.–15dBm/载波 C.–20dBm/载波 13.电梯井中天线的发射功率不大于 C (1分)dBm/载波。 A.10 B.15 C.20 14. 要求在设计覆盖范围内95%的位置上所测得的手机接收信号强度不得低 于 A (1分)dBm。 A.-93 B.-90 C.-85 15. 以直放站为信号源的室内覆盖系统，覆盖区域内误码等级 为 A (1分)。 A.0~2占90% B.0~2占95% C.0~2占100% 16. 以基站为信号源的室内覆盖系统，覆盖区域内误码等级 为 B (1分)。 A.0~2占90% B.0~2占95% C.0~2占100% 17. 以直放站为信号源的室内覆盖系统，要求楼层覆盖区域内场强 为 B (1分)。 A.不小于-85dBm占90% B.不小于-85dBm占95% C.大于-85dBm 占95% 18.以基站为信号源的室内覆盖系统，要求电梯覆盖区域内场强 为 C (1分)。 A.不小于-90dBm占95% B.大于-90dBm占90% C.不小于-90dBm 占100% 19. 在测量直放站使用标准输出负载是一个能承受被测设备输出功率 的 B (1分)非辐射性电阴负载。 A.60Ω B.50Ω C.40Ω D.30Ω 20. 带内波动是指在有效工作频带内最大和最小电平之间 的： A (1分) A.差值 B.平均值 C.和值 D.乘值 21. GSM信道选择式直放站所在施主小区的载波数必 须 B (1分)直放站的信道数。

新概念英语第二册课测试题

新概念英语第二册课测 试题 文档编制序号：[KK8UY-LL9IO69-TTO6M3-MTOL89-FTT688]

N e w C o n c e p t E n g l i s h B o o kⅡ1-9 一、单项选择 1、I went to the supermarket and bought a great many 2、He until it stopped raining. B. didn't wait C. leave 3、——Hey, how are you getting with your girlfriend —— A .It’s none of your business! me! C .Take it easy. yourself. 4、A great number of students fond of films, but a good student seldom to the cinema A. are,goes B. is,goes C. are,go D. is,go 5. I’m _______ in that ________ film A. interesting, interested B. interested, interesting C. interested, interested D. interesting, interesting 6. It’s very cold. _______ your coat. A. Take off B. Put on C. Turn on off man could not bear could not it. calls at every house in the everyone. at out at detectives were a valuable parcel of diamonds.

雅思口语Part2答案：成为你朋友的人

雅思口语Part2答案：成为你朋友的人参考答案： Though I have many friends, my friendship with them grew up with times and mutual understanding. But I can recall that my friendship with George grew up almost all of a sudden. George is senior to me by 2-3 years and I did not meet him until I was in the 4th semester in my University. One of my term final exam's schedules was changed and I did not know that. According to my previous exam schedule I reached my University and was totally confused what to do when I heard that the exam was already over. I went to our Departmental head's office and he could not find a way around of it. He blamed me that I should have been more careful about the changes. I explained him that I was sick and did not come to university for 3-4 days and that made me unaware of the exam schedule changes. Then I found that someone who was sitting next to me in the departmental head's office asked me to meet the course teacher and explain the situation. He then escorted me to our course teacher's room and talked to the teacher. It seemed to me that George was already personally known to our teacher and they had an intimate relationship. Hearing everything the teacher agreed to arrange an exam for me next day in his office room. My friendship with George grew up after that event and albeit our age differences we found that we had many common interests and habits. We started spending time and I visited his home many times. We worked in a retail shop for about 6 months and that helped us become more intimate.

直放站与室内分布系统原理练习题

直放站与室内分布系统原理练习题 一、单选题 1.直放站到达施主基站的上行噪声电平必须小于 C dBm A.-36 B.-94 C.-113 D.-120 2.直放站系统中覆盖天线与施主天线之间的隔离度应大于直放站实际工作增益加 上 D dB的冗余储备。 A.3 B.5 C.10 D.15 3.100mW等于 C dBm。 A.40 B.33 C.20 D.30 4.下列直放站采用的设备中， C 没有信号放大功能。 A.直放机 B.有源天线 C.耦合器 D.干线放大器 5.以下关于直放站施主天线的描述，哪个是正确的？ D A.位置越高越好 B.位置越低越好 C.尽量使用全向天线 D.尽量使用方向性好的天线 6.直放站三阶互调指标的测试，哪个说法是错误的？ C A.在2f1-f2处测量 B.在2f2-f1处测量 C.在(f1+f2)/2处测量 D.A和B 7.室内信号源泄漏至室外10米处的导频信号强度不高于 A A. －90dBm B. －94dBm C. －85dBm D.-105 dBm 8.直放站天线隔离度不足会引起： B A.烧坏直放机模块 B.直放站自激不工作 9. C.堵塞基站 D.业务天线发射功率过大 10.对于选频直放站的频点改变是由 C 操作。 A.BSC终端 B.自动随施主信号频率变化而变化 11. C.本地终端设置 12.1/2普通馈线100米线损为： C A.3dB B.5dB C.7dB D.9dB (0.077*100=7dB) 13.测直放站收发信隔离度是把频谱仪的RF OUT口和RF IN口分别连接到 A A.覆盖天线，施主天线 B.施主天线，覆盖天线 14.室内电梯覆盖为免入电梯发生掉话一般使用 B 直放机。 A.光纤 B.宽频 C.选频 D.微波 15.直放站不宜作为信号源覆盖： D A.信号盲点 B.民居平房 C.山区道路 D.高层建筑 二、多选题 9．直放站干扰基站的原因？ABCD

最新新概念英语第二册-1-5课测试题

New Concept English BookⅡLesson1---Lesson5 1 一、单项选择 2 1. the teacher at this college last year ? Yes, he did. 3 A. Did, taught B. does, teach C. Did, teach D Do,teach 4 2、I went to the supermarket and bought a great many 5 A.tomatos B.potatos C.vegetables D.meat 6 3、He until it stopped raining. 7 A.waited B. didn't wait C. leave D.left 8 4、For the whole period of two months, there no rain in this area. 9 A.is B.will be C.has been D.have been 10 5、——Hey, how are you getting with your girlfriend? 11 —— 12 A .It’s none of your business! B.Dear me! 13 C .Take it easy. D.Enjoy yourself. 14 6、A great number of students fond of films, but a good student seldom to the 15 cinema 16 A. are,goes B. is,goes C. are,go D. is,go 17 7、If their house not like ours, what it look like? 18 A.is, is B.is, does C.does, does D.does, is 19

雅思口语Part2参考答案之开心的事

雅思口语Part2参考答案之开心的事 一、参考范文 There are numerous happy events in my life that I can recall and among them I would like to talk about the day that I was blessed with a little sister. This was an event that I still recall vividly. I was then only 7-8 years old and when I saw a little angel was crying on my mother's lap, I became the happiest man in the world. I was the only son of my parents and when I heard that I will have another sibling, I got very excited and I was counting days when this brother/ sister of mine will come. I speculated and imagined lots of things I would do with my sibling. On the day that my sister came in to the world was one of the happiest days of my life. For the first time I felt a strong urge to kiss this little fairy child. She was so beautiful and adorable that I thanked God for the gift. My mother asked me to hold her and kiss her but I was afraid to touch her as I thought that might hurt her. I felt like I was flying on that day. My mother gave birth of the baby in a hospital and I was so happy and attached by the event that I denied to return home at night. I stayed in the hospital cabin for about 4-5 days till my mother and sister came home. I came back home with the most precious gift of the world. 二、答题思路 Tips for answering this Cue card topic： You are free to talk about any events of your life that made you happy. You should mention the event, when it

(完整版)新概念英语第二册测试题.docx

新概念英语第二册周测 一、单选 1.Some of this meat came from Canada. How about _____? A) another B) the other C) others D) the rest 2.You can borrow my tape-recorder _____ you return it to me tomorrow. A) unless B) as soon as C) until D) provided 3.Emily wrote to ______ of her parents last week, but she has written to _____ of them thisweek. A) both, either B) both, neither C) neither, both D) either, both 41.the teacher at this college last year ? Yes, he did. A. Did, taught B. does, teach C. Did, teach D . Do, teach 5、 He until it stopped raining. A. waited B. didn't wait C . didn't leave D. left 6、 For the whole period of two months, there no rain in this area. A. is B. will be C. has been D. have been 7、—— Hey, how are you getting with your girlfriend? —— A. It's none of your business B. Dear me! C .Take it easy. D. Enjoy yourself. 8、 If their house not like ours, what it look like? A. is, is B. is, does C. does, does D. does, is 9. I ’ m _______ in that ________ film A. interesting, interested B. interesting, interesting C. interested, interested D. interesting, interesting 10.------ Hurry up! We have little time! ------ I ____________. A. will come B. come C. shall come D. am coming 11. I don ’ t have ______writing paper, I only have _____chalks. A. any, any B. any, some C. some, some D. some, any 12. Look, the little dog ______after a big cat! A. runs B. is running C. is going to run D. is running 13.Just then, the telephone rang. It rang. A. at once B. immediately C. again D. at that moment 14.How many times did the clock. A.hit B .beat C. knock D. strike

雅思口语Part2答案：在校学习的课程

雅思口语Part2答案：在校学习的课程 参考答案: The subject that I'd like to describe is Physics that was taught in our school. We had this subject in each year of our high school and each year a new teacher used to taught us the subject. Even we had to read physics in college as Science was my major. I remember Mr. Alex, Burter, John, David and Mrs. Jeniffer took Physics in different years. We were lucky to have good Physics teachers who could make the subject interesting and enjoyable. Our teachers used to tell us stories first and then would explain the theory, experiment or math of the text books. They would then relate the story with the study. Later they would explain us the real examples and facts. Sometimes they used to take us to the Physics labs and explain how something works. I have learned numerous things of physics from simple definition of mass to the complex explanation of Einstein's Theory of Relativity. My foundation of physics grew up and expanded with the help of those teachers. The subject itself is utterly interesting if one can have passion for it. It is one such subject that one would start loving it if s/he starts understanding the underlying concepts of it. Physics is all around us and the lesson I learned from my School had helped me greatly throughout my higher academic years. Tips for answering this cue card topic: You should pick a real academic subject like Math, English, Physics, Chemistry, Literature, and Biology to answer this cue card. Then quickly take some notes including the following: 1. In which class was it taught? 2. Do not pick a subject taught in your college or university level as the cue card is asking you to talk about a subject taught in your school. 3. Try to remember a teacher's name. You can mention multiple teachers' name as the same subject in school is taught by different teachers in different classes. 4. Give a short detail what the subject. For example: The Geography would discuss about the Earth, the other planet in the solar system, atmosphere, and climate changes etc. and you should mention those. 5. Next describe how the teacher taught the subject and what things you learned from the class. 6. Mention some interesting things you learned from the class and how the teacher made things easier to understand for you. 7. Describe how interested you were about the subject and the class. 8. Relate how this subject has later helped you/ influenced you in your education and learning process. 9. Finally give a conclusion by mentioning how beneficial the subject for students. If you pick Math try to focus on the following issues: 1. The teacher was very good explaining the intricacies of the subject. 2. You learned many theories and formulas of math. 3. This teacher explained how math would be helpful for the rest of the life and academic years.

直放站试题A

一、单项选择题 1、以下设备哪些是无源设备( D ) A、功分器 B、耦合器 C、衰减器 D、以上都是 2、以下设备哪些是有源设备( A ) A、干线放大器 B、合路器 C、板状天线 D、负载 3、室外天线与跳线的接头应作( B )，连接天线的跳线要求做一个“滴水湾”。 A、防锈处理 B、防水处理 C、防电处理 D、防火处理 4、馈线的布放必须按照设计文件的要求，且应整齐、美观、不得有( D )情况。 A、交叉 B、扭曲 C、空中飞线 D、以上三种 5、室内馈线布放应尽量使用( C )，避免与强电高压管道和消防管道一起布放。 A、风管井 B、水管井 C、电气管井 D、天井 6、室内馈线应尽量在线井和天花吊顶中布放，对于不在机房线井和天花吊顶中布放的馈线，应套用(A )。 A、PVC管 B、钢管 C、铜管 D、热缩管 7、地下停车场的布线应(B )排风，消防等管道。 A、低于 B、高于 C、水平 D、无所谓 8、直放站、干线放大器必须按地，接地面积为(C )平方毫米。 A、12 B、14 C、16 D、20 9、室外天线都应在避雷针的( A )度保护角之内。 A、45 B、60 C、90 D、120 10、主机保护地，馈线、天线支撑件的接地点应( C )。 A、拧在一起 B、后两者拧在一起 C、分开 D、无所谓 11、室内覆盖的主要作用是(C )

A、吸收话务 B、网络优化 C、信号补盲 D、以上三者都是 12、移动用户离开归属的局到其他交换局内登记成为移动用户，这种现象称( B )。 A、切换 B、漫游 C、频率复用 D、掉话 13、为适应部分站点的特殊需要（如抑制联通信号或抑制干扰，要求宽带直放站的带宽范围内可调，具体工作频带的设置按设计文件。（C） A：1-25MHz B：2-25MHz C：2-19MHz D：1-6MHz 14、直放站的带内平坦度（峰峰值） B 。 A：小于2dB B：小于3dB C：小于1C D：小于4dB 15、测试现场直放站的实际上下行增益 C 并与直放站标注的增益值比较是否一致，误差范围在±10%内. A:输入信号功率+直放站上下行衰减值 B:输出信号功率+直放站上行衰减值 C:输出信号功率-输入信号功率 D:输出信号功率+输入信号功率 16、分别在直放站的输入端和输出端测试其至施主天线和覆盖天线的驻波比，其驻波比要求 C 。 A：小于1.3 B: 小于1.4 C:小于1.5 D: 小于1.8 17、从基站接收端位置测试上行噪声电平，要求噪声电平平均 D 。 A：小于-103dBm B：小于-112dBm C：小于-125dBm D：小于-120dBm 18、干线放大器最大输出功率应 B A：大于35dBm B：大于30dBm C：小于30dBm D：小于25dBm 19、从人体安全辐射范围要求考虑，要求室内天线发射功率不大于 D 。 A：10dBm/载波 B：13dBm/载波 C：20dBm/载波 D：15dBm/载波 20、从人体安全辐射范围要求考虑，要求电梯井中天线的发射功率不大于 C 。 A：15dBm/载波 B：18dBm/载波 C：20dBm/载波 D：22dBm/载波 21、对于双波段或高波段器件及天线，其驻波比指标可增大至 B 。

新概念英语第二册课测试题修订稿

新概念英语第二册课测 试题 集团标准化工作小组 [Q8QX9QT-X8QQB8Q8-NQ8QJ8-M8QMN]

New Concept English BookⅡ Lesson1---Lesson5 一、单项选择 1. the teacher at this college last year Yes, he did. A. Did, taught B. does, teach C. Did, teach D Do,teach 2、I went to the supermarket and bought a great many A.tomatos B.potatos C.vegetables D.meat 3、He until it stopped raining. A.waited B. didn't wait C. leave D.left 4、For the whole period of two months, there no rain in this area. A.is B.will be C.has been D.have been 5、——Hey, how are you getting with your girlfriend? —— A .It’s none of your business! B.Dear me! C .Take it easy. D.Enjoy yourself. 6、A great number of students fond of films, but a good student seldom to the cinema A. are,goes B. is,goes C. are,go D. is,go 7、If their house not like ours, what it look like? A.is, is B.is, does C.does, does D.does, is 8. I’m _______ in that ________ film A. interesting, interested B. interested, interesting C. interested, interested D. interesting, interesting 9. -------_____________ -------I am Italian. A.What’s your job B. What’s your name C. What nationality are you D.Where do you from 10. I don’t have ______writing paper, I only have _____chalk s. A. any, any B. any, some C. some, some D.some,any 11. Look, the little dog ______after a big cat! A. runs B. is running C. is going to run D.is runing 12. It’s very cold. _______ your coat. A. Take off B. Put on C. Turn on D.Put off 13.The man could not bear it.He could not it. A.carry B.suffer C.stand D.lift 14.On the last day he made a big dicision.It was the day of his holiday. A.final B.end https://www.sodocs.net/doc/884967518.html,test D.bottom 15.He calls at every house in the street.He everyone. A.shouts at B.calls C.cries out at D.visits

雅思口语Part2参考答案之到你家做客的人

雅思口语Part2参考答案之到你家做客的人 一、参考范文 We often have guests, visitors and relatives in our home and for special occasions like a birthday party several invited guests come to our home. One such occasion and special guest I remember came to our home 2-3 years back. He was a famous writer and came to our home on occasion of my older sister’s marriage ceremony. He was known to the father of the bridegroom’s senior brother and a well-known figure in our city. His name is Mr. Jonathon Durik (…say a name you like…) and when he arrived all of us recognized him. The marriage ceremony was a big program and almost 200 people attended the ceremony. We had to prepare for the program for about a week before the due date. This ceremony was arranged in our own house and we had been tremendously busy for the occasion. A marriage ceremony is a big arrangement and my parents were very busy as well as sad that my sister would be leaving our house after her marriage. This was a big event and there were lots of things to be done. I had been so busy and had to greet and serve so many guests that I had hard time concentrating. The bridegroom and their relatives arrived and we got even busier. They introduced the guests to us and one of them was Mr. Durik. I greeted him and helped him sitting in a comfortable couch. I got busy with other stuffs and came to the guests time to time to look after if he needed anything. I asked what type of foods he would prefer to eat and took him to the dinning place. I had a short conversation with him

网优题库(答案)

网优中心题库 一、填空题： 1、信号在无线空间的衰减分为两种：路径衰落和阴影衰落；多径衰落包括瑞利衰落和时间色散。 2、MSTXPWR的设置主要是为了控制邻区间的干扰。MSTXPWR过大会增加邻区间的干扰；而 MSTXPWR过小可能导致话音质量的下降，甚至产生不良的切换动作。 3、四种突发脉冲序列：普通突发脉冲序列、频率校正突发脉冲序列、同步突发脉冲序列、接入突发脉冲 序列。 4、在GSM系统中，传输方式有普通和不连续传输（DTX）两种摸式，目的是降低空中的总的干扰电平， 节省无线发射机电源的耗电量。 5、基站天线的类型：全向天线、定向天线、特殊天线、多天线系统。 6、设置小区重选滞后（CRH）目的是：要求邻区（位置区与本区不同）信号电平必须比本区信号电平大， 且其差值必须大于小区重选滞后规定的值，移动台才启动小区重选。 7、误码率（BER）的定义：检测到接收信号中不正确的bit数占总的bit数的百分数。为了减少长序列的 bit误码，GSM编码技术中采用了交织技术。 8、业务信道的种类：全速率业务信道（FR）、半速率业务信道(HR)、增强型全速率业务信道(EFR)。 9、访问用户位置寄存器(VLR)是服务于其控制区域内移动用户的，存储着进入其控制区域内已登记的移 动用户相关信息，为已登记的移动用户提供建立呼叫接续的必要条件。 10、当话务分担功能打开时，在一个小区内，如果空闲的全速率业务信道小于等于参数CLSLEVEL时， 则会发生因话务分担而产生切换。 11、MRR 的功能：统计上下行信号的强度、统计上下行话音质量、时间提前量、上下行路径损耗、 MS的功率电平和BTS的功率减少量。 12、R XQUAL表示话音质量，当RXQUAL=0时表示质量最好，当RXQUAL=7时表示质量最差。 13、S GSN与BSC之间的接口为Gb，该接口的协议标准是帧中继。 14、T RU的主要功能是：信号处理、无线接收、无线发送、功率放大。 15、小区规划要考虑几个方面：population distribution ,coverage requirements(indoor/outdoor), penetration rate for mobile telephony service,traffic per subscriber ,traffic per subscriber ,available frequency band, grade of service on the air interface(GOS) ,co_channel interference (C/I), topography and terrain type, output power restrictions , maximum antenna height。 16、在GSM中语音编码是采用线性预测编码—长期预测—规则脉冲激励编码。 17、在GSM中采用的调制方式为高斯滤波最小频移键控数字调制方式（GMSK）。 18、R BS 2202的和分路单元三种类型：CDU-A、CDU-C+、CDU-D。 19、手机在空闲状态时，有四个过程：PLMN的选择、小区选择、小区重选、位置更新。 20、频率校正信道（FCCH）作用：为了保证移动台和基站能够正确的接收对方的信息，必须保证移动台 和基站的频率一致。 21、系统消息3（BCCH上发送）中的网络参数：小区识别（Cell identity）、位置区识别（Location area identity）、控制信道描述（Control channel description）、小区选项(Cell options)、小区选择参数（Cell selection parameters）、RACH控制参数（RACH control parameters）、选择参数（Selection parameters）、功率偏移（Power offset）。 22、功率控制技术是指在保证和移动台之间具良好的接收质量的条件下，降低发射功率，从而达到降低 干扰的目的。 23、直放站的应用场合主要有以下几种：扩大服务范围，消除覆盖盲区；在郊区增强场强，扩大郊区站 的覆盖；沿高速公路架设，增强覆盖效率；解决室内覆盖；将空闲基站的信号引到繁忙基站的覆盖

新概念英语第二册_1-9课测试题(答案版)

New Concept English BookⅡ 一、单项选择 1. the teacher at this college last year ? Yes, he did. A. Did, taught B. does, teach C. Did, teach D Do,teach 2、I went to the supermarket and bought a great many A.tomatoes B.potatos C.vegetables D.meat 3、He until it stopped raining. A.waited B. didn't wait C. didn’t leave D.left 4、For the whole period of two months, there no rain in this area. A.is B.will be C.has been D.have been 5、——Hey, how are you getting with your girlfriend? —— A .It’s none of your business! B.Dear me! C .Take it easy. D.Enjoy yourself. 6、A great number of students fond of films, but a good student seldom to the cinema A. are,goes B. is,goes C. are,go D. is,go 7、If their house not like ours, what it look like? A.is, is B.is, does C.does, does D.does, is 8. I’m _______ in that ________ film A. interesting, interested B. interested, interesting C. interested, interested D. interesting, interesting 9. ------ Hurry up! We have little time! ------ I ____________. A. will come B. come C. shall come D. am coming 10. -------_____________? -------I am Italian. A.What’s your job B. What’s your name C. What nationality are you D.Where do you from 11. I don’t have ______writing paper, I only have _____chalk s. A. any, any B. any, some C. some, some D.some,any 12. Look, the little dog ______after a big cat! A. runs B. is running C. is going to run D.is runing 13. It’s very cold. _______ your coat. A. Take off B. Put on C. Turn on D.Put off 14.The man could not bear it.He could not it. A.carry B.suffer C.stand D.lift 15.Just then,the telephone rang.It rang . A.at once B.immediately C.again D.at that moment 16.On the last day he made a big dicision.It was the day of his holiday. A.final B.end https://www.sodocs.net/doc/884967518.html,test D.bottom 17.He calls at every house in the street.He everyone. A.shouts at B.calls C.cries out at D.visits