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一只电流表满量限为10A，准确等级为0.5，用此表测量1A电流时的相对误差是多少？

答案

参考答案：最大相对误差△m=+0.5%*10=+0.05A.

测量1A电流时的相对误差=+5%

填空题

用所给词的适当形式填空。

1. Don't be ________ (worry) about his English. He can learn it well.

2. Tom is a lovely boy, many people like ________ (he).

3. Mike's ________ (parent) are doctors. They work in the same hospital.

4. There are fifty students in our class. They come from different ________ (country).

5. They go to the zoo by subway. It takes ________ (they) 30 minutes to get there.

6. Tom is crazy about ________ (play) computer games, so he is weak in his study.

7. I have a dream, I want ________ (fly) into the space someday.

8. Are you interested in ________ (see) English movies?

9. There aren't ________ (some) flowers in front of the house.

10. We go to school by bike. It takes ________ (we) 15 minutes to get there.
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单项选择题

岩石路基开挖的基本方法是：（）

A.水夯法

B.振动法

C.爆破法
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