问题
单项选择题
滞后环节的微分方程为（），传递函数为（）。
A.A
B.B
C.C
D.D
答案
参考答案：A
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滞后环节的微分方程为（），传递函数为（）。
A.A
B.B
C.C
D.D
参考答案：A
| 用方框中词的适当形式填空,一空一词，一词一次。 | |
In America, school starts  at eight thirty, so I usually get up at seven o’clock.What time does school start in China? Tell me please! I have ____2___at seven thirty. Then I go to school. My favorite is math , because I think it’s ___3_____ and I like my math teacher very much.. At school, I have a good friend. ___4___name is June. June really likes sports. She has a great sports collection. She has eleven basketballs and ten ____5____. She plays sports every day. At school, we have many sports ____6____. We can play sports there. June likes eating vegetables and fruit. She likes __7_____ and pears. She thinks they are good. ___8__ I don’t like them. I like salad. She likes reading, too. She has a big book  ____9____. There are lots of books in it. Do you want an _____10_____ friend? Please write to me. |