已知正弦电流的初相角为90°，在t=0时的瞬时值是17.32A，经过s后

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问题单项选择题

已知正弦电流的初相角为90°，在t=0时的瞬时值是17.32A，经过s后电流第一次下降为0，则其角频率为（）rad/s。

A.78.54

B.50

C.39.27

D.100

答案

参考答案：A

填空题

用形容词性物主代词或名词性物主代词填空。

1、It isn't pen, it's . (he, she)

2、Is it eraser? No, it's not . It's . ( you, I, he)

3、Have you got umbrella ? (you) Yes, l've got . ( I )

4、 schoolbag is heavier than .(he, she)

5、Whose bedroom is bigger, or ? (we, they)

6、Do you like Chinese teacher ? I love Chinese teacher very much. (you, we)

7、They're doing homework. (they)

8、Whose knife is it ? It's . (she)

9、I have a cat. name is Mimi. (It)

10、How does Mike spend holiday? (he)

填空题

40983657中，4在______位，表示______，6在______位，表示______．