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因为构成力偶的两个力满足F= - F’，所以力偶的合力等于零。
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He must be_________(mental) disabled. Lots of rescue workers were working around the clock,_________(send) supplies to Yushu, Qinghai province after the earthquake. On Sunday morning in August I went to local music festival.I left it early because I had an appointment_________(late) in the day. It is easy for him to make up_________ mind and also easy to change it. _________is known to all that the time we can use is limited. He feels it his duty________ (help) others. The temple in bad condition needs_________(repair). Do not put off what can be done today_________tomorrow. After the flood Mr.Deng was as poor as a church _________. I can send a message to Kenya whenever I want to, and _________ gets there in almost a second.
预习准备strategic/ performance/ consist/ concentrate/ qualified/ screen/ probation/ cooperative/ conclude要求：1.通过有道词典查询逐一查询上述单词；2. 每个单词至少摘抄2个例句；3.尽可能多地列举每个单词的同源词，并注明词性；4.熟悉上述单词的用法和例句，随堂通过听写、翻译等形式检测；5.所做笔记拍照或扫描及时上传。
5.预习准备compare/ outstanding/ ambition/ fringe要求：1.通过有道词典查询逐一查询上述单词；2.每个单词至少摘抄2个例句；3.尽可能多地列举每个单词的同源词，并注明词性；4.熟悉上述单词的用法和例句，随堂通过听写、翻译等形式检测；5.所做笔记拍照或扫描及时上传。
（你手里的这本书）was written by my sister. （每天晚上八点到十点）,he sits on the sofa watching TV. The mother told the little boy（不要在街上跑）. As soon as（父亲进入房间），the children stopped fighting at once. I didn’ t go to Tom’ s birthday party（因为他没有邀请我）.
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