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正交剖面

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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。

A. 对
B. 错

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。