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批合格就是指该检查批中每个产品都合格。

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参考答案：错

填空题
选词填空。
cheer up,    in time,    get the hang of,    now that,    watch out
be fundamental to,    give birth,    escape from,    break out,    be forced to
1. _____ you have mentioned it, I'll remember to take care of your pet when you go traveling.
2. With the help of the guidebook, you can soon _____ the usage.
3. The continued presence of water _____ to the development of ancient life.
4. After the war _____, they _____ leave their homeland.
5. Don't worry; you will succeed _____ if you keep working hard.
6. I advised them to _____ for the dog.
7. Try and _____ a bit; life isn't that bad!
8. A lion has _____ the zoo.
9. A good hobby _____ a successful business.
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问答题

质量m=10kg的物体静止在水平地面上，当用F=15N的水平推力向右推物体，在水平地面运动t1=4s后，撤去力F．若物体与地面间动摩擦因数μ=0.1，物体与地面间最大静摩擦力fm=12N，求（g=10m/s2）：

（1）4s末的速度的大小；

（2）撤去F后还能滑动多长的时间；

（3）从开始运动到最后停下所滑动的距离．
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