题目内容

In a lathe, the gears between the spindle and the feed shaft control the speed of rotation of the shaft.

A. 对
B. 错

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In turning, the two centers of a lathe must be on the same line.

A. 对
B. 错

In a athe , the cutter is clamped in the tool post and the tool is fixed on the tailstock.

A. 对
B. 错

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what is the nominal size?(在文中找到答案并翻译）