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【多选题】
与交流输电相比,直流输电存在的问题是( )。A.
换流装置造价昂贵
B.
换流站在运行中要清耗大量无功功率
C.
换流装置在运行中会产生谐波需要装设滤波装置
D.
直流输电不稳定
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举一反三
【简答题】克隆基因的主要目的有四个：（1）（）； （2）（）； （3）（）； （4）（）。
【单选题】—_____. —OK. Is this your watch? —Oh, yes. It's my watch. Thanks. [ ]
A.
I'm doing my homework
B.
I'm looking for my watch
C.
I'm watching TV
D.
I'm looking for my brother
【单选题】Oh, thanks, but... maybe some ________ time.
A.
other
B.
another
C.
the other
D.
others
【单选题】听力原文：M: Well, Amina, thanks for letting me have your draft in such good time. W: Oh, that's alright. I was just very anxious to hear what you think of it. You can see that I decided to change the topi...
A.
He thinks the choice of Barings Factory is better.
B.
He thinks the choice of the hospital is better.
C.
He thinks there is no need to change the topic.
D.
He thinks the choice of the university is better.
【单选题】听力原文：M: Oh, no thanks. W W: So, how are things going, Steve? M: Well, to be honest, Carla, I was feeling great on Saturday, but I started to feel sick Sunday afternoon. I thought I'd get better, but I...
A.
He has a cold.
B.
He has the flu.
C.
He has a stomachache.
D.
He had a headache.
【单选题】---Excuse me. Could you tell me the way to the zoo? ----Sorry, I’m new here. ----Oh.______.
A.
Thanks anyway
B.
My pleasure
C.
Never mind
D.
No problem
【简答题】克隆基因的主要目的有四:(1) ,(2) ,(3) ,(4) .
【单选题】听力原文：M: Well, Amina, thanks for letting me have your draft in such good time. W: Oh, that's alright. I was just very anxious to hear what you think of it. You can see that I decided to change the topi...
A.
He thinks the choice of Barings Factory is better.
B.
He thinks the choice of the hospital is better.
C.
He thinks there is no need to change the topic.
D.
He thinks the choice of the university is better.
【多选题】下面关于实因果线性相位 FIR 数字滤波器的描述中,哪项是正确的?
A.
该滤波器一定稳定
B.
该滤波器的零点共轭成对且与单位圆成镜像对称。
C.
该滤波器的极点一定全部在z平面的原点处。
D.
该滤波器的群延迟为常数。
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