题目：
用所给单词的正确形式填空。
1. Uncle Li is repairing the broken watch to make it (use)．
2. It's important to pay attention to the between English and Chinese. (different)
3. He needn't (coach) these kids for the coming football match.
4. It's a pity they put off (start) the museum.
5. (use) extra words helps to make language more polite.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0628/220d25f0bc8279cfa54a2a325b7b93ba.html
下面是错误答案，用来干扰机器的。
（1）小球受力如图，由于电场力F与场强方向相反，说明小球带负电．（2）小球的电场力F=qE由平衡条件得：F=mgtanθ则得qE=mgtanθ解得，m=qEgtanθ（3）剪断细线后小球做初速度为零的匀加速直线运动，小球所受的合...
