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问题 单项选择题

柜、屏、盘间线路和线对地间绝缘电阻值，配电线路必须大于（）MΩ，二次回路必须大于（）MΩ。

A、0.5，1

B、1，0.5

C、0.5，1.5

D、1，1.5

答案

参考答案：A

填空题

选词填空用方框中所给短语或单词的适当形式填空。（每题2分，满分20分）

小题1:If you ___________________birds,you can go to Zhalong.

小题2:His parents died when he was ten years old..He had to _________________.

小题3:Tom got up very late,______________,he was late for school this morning.

小题4:What shall I do if I want _______________________the club?

小题5:The teacher asked me ____________________in class again.

小题6:My father is a good driver. He has a pretty good sense of direction(方向). He never _____________ in the city.

小题7:He broke his arm in the accident and can_______play basketball___________.

小题8:Are tigers __________________________now?

小题9:The information can make people_________________take action to protect birds.

小题10:They are_____________________their favourite animals.
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选择题

以下说法中正确的是(    )

A．合力的大小一定大于分力的大小

B．合力的大小至少大于一个分力的大小

C．合力的大小可以比两个分力都小，也可以比两个分力都大

D．若两个分力F1>F2，则合力大小的变化范围是F1>F>F2
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