题目内容

曲柄滑块机构中,滑块为主动件时,该机构具有死点位置。()

A. 对
B. 错

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机构中易出现死点位置,应尽量避免。()

A. 对
B. 错

In this area of London, many people dress

A. casually
B. stylishly

Hip hop fashion first came from

A. New York
B. Sao Paulo

It was first popular in the

A. 1980s
B. 1990s

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