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问题
单项选择题
对PID调节器叙述不正确的是()。
A.抗干扰能力强
B.消除滞后
C.具有PID三种功能
D.不能同时具有PID三种功能
答案
参考答案:D
填空题
根据句意选择正确的单词,将其序号填在横线上。
A. Come on B. they C. feet D. ask
E. report F. hot G. Tommy's
1. It's
today. Put on your shorts.
2. The shoes are on your
.
3.
, Zoom. It's time to go.
4. They're
pants.
5. This is the weather
.
6. What are
? They're socks.
7. Let's
the teacher.
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判断题
由于光纤双折射的存在,将引起光波的偏振态沿光纤长度发生变化。
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