题目内容

锯软材料要加大压力和加快锯速,以提高生产率。

A. 对
B. 错

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孔将钻穿时,进给量要减小。

A. 对
B. 错

在小薄片工件上钻孔,应尽量用手拿着工件。

A. 对
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Are you going to join ()? You are a good swimmer.

A. the swimming contest
B. cycling race
C. walking festival
D. fishing contest

A: There is a () of a swimming contest at the school gate.B: Great! I' ll go and check the details.

A. announcement
B. poster
C. paper
D. sheet