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【多选题】
已知系统结构如下图所示，采样周期T = 0.25秒,【图片】，【图片】符合系统描述的为（）【图片】A.
系统的开环脉冲传递函数
B.
系统的开环脉冲传递函数
C.
时，系统稳定
D.
时，系统稳定
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【单选题】8 Is this ____first time you ’ ve flown on ____ British Airways?
A.
[A] the,/
B.
[B] the,a
C.
[C] a,the
D.
[D]/,a
【简答题】任务型阅读 Pearl and June were good friends and spent most of their time together. They were both very old and they worried about their health. Most of the time they talked about nothing else. They worried...
【单选题】You ’ ve done it twice. Why not try ___ time?
A.
third
B.
the third
C.
a third
D.
once
【单选题】Many people think a telephone is essential. But I think it is a pest and a time waster. Very often you find it impossible to escape from some idle or inquisitive chatter-box, or from somebody who want...
A.
Harmful thing.
B.
Insignificant thing.
C.
Troublesome thing
D.
Trivial thing
【简答题】Passage A Quality Time You ’ ve just been given a major task and want to do it well, but it seems that the minute you get started, you ’ re interrupted. First, jane stops by. Then, it ’ s the phone. L...
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