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问题 单项选择题

选用gG型熔断器时，应使其安秒特性曲线计及偏差后略高于电动机的起动电流和起动时间的交点。根据经验，一般应不小于电动机额定电流（IM）的（）。

A.1.5～2.3倍

B.1.1～1.3倍

C.1.3～1.5倍

D.2.5～7.0倍

答案

参考答案：A

填空题

根据句义和首字母完成下列单词。

1. My f_______ colour is blue.

2. Your friends look d_______.

3. He has a s________.

4. Danny is h________. He wants to eat.

5. Jack does his h_______ in the evening.

6. I like p_______ for breakfast.

7. Mary likes cereal. It's d________.

8. Would you like a h________?

9. They have lunch in a r________.

10. She doesn't like v________.

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单项选择题

单缸四行程柴油机，曲轴旋转（）度，活塞做一次功。

A．180

B．360

C．540

D．720
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