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问题 多选题
如图所示，理想变压器的原副线圈匝数比n1：n2=1：10，副线圈与阻值R=20Ω的电阻相连．原线圈两端所加的电压u=20sin20πt(V)，则（　　）

A．副线圈输出交流电的频率为10Hz

B．交流电压表的示数为20V

C．电阻R上消耗的电功率为2kW

D．原线圈中电流的最大值为100A

答案

AC

填空题

用所给词的适当形式填空。

1. I didn't finish _____ ( write)  my test because I had no time.

2. My father is interested in _____ ( fish)  when he is free.

3. Young ladies love to wear _____ ( color)  clothes.

4. He has been _____ ( teach)  in this school for ten years.

5. Chinese medicine is not very popular in many _____ (west) countries.

6. We all know that Beijing is the _____ ( capital) of China.

7. Both Germany and France are _____ ( Europe) countries.

8. Thank you for _____ ( give)  me so much help.

9. I have lived here since I _____ ( be)  born.

10. — Mom,could I have an MP4 like this?

      — Certainly. We can buy a _____ ( cheap)  one,but as good as this.
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单项选择题

追越条款优先于：（）

A.船舶在任何能见度情况下的行动规则

B.船舶在互见中的行动规则

C.船舶在能见度不良时的行动规则

D.船舶在任何能见度情况下的行动规则与船舶在互见中的行动规则
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