小华用钓鱼竿钓起重为15N的鱼，如图所示，OA=0.4m，OB=2m。下列说法正

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问题选择题

小华用钓鱼竿钓起重为15N的鱼，如图所示，OA=0.4m，OB=2m。下列说法正确的是

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A．用钓鱼竿钓鱼费距离

B．钓鱼竿是个省力杠杆

C．手对鱼杆的拉力Fi的大小为75N

D．手对鱼杆的拉力Fi的大小为3N

答案

答案：C

填空题

单词拼写。

1. For him, this will be an e____ new job, so he isn't sure of it.

2. The windows haven't been cleaned for at least a year and are d____ now.

3. I tried to tell her but she ____ (不理睬) me

4. I'm rather ____ (挂念) about my brother's health.

5. Milk is the ____ (自然) food for young babies. 6 Forces are ____ (蕴藏) in the masses.

7. He went to town with the ____ (目的) of buying a new television.

8. We are asked to learn about some ____ (交际) skills in this unit.

9. Since the weather is so fine, let's go o____.

10. They come from Germany. They are G____.

判断题

磁路和电路一样，也有开路状态。