题目内容

与双向式对称棘爪相配合的棘轮,其齿槽必定是梯形槽。

A. 对
B. 错

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试举出四种以上的机构能够实现间歇运动?并选择其中的一种分析其组成结构和工作特点?

1.Last week, I until midnight every night.

A. work
B. worked
C. was working
D. have worked

2.The play tour around the country.

A. shall
B. will
C. is going to
D. go to

3. I see my friend off this afternoon.

A. shall
B. will
C. am going to
D. go to