题目内容

车床主轴的纯径向跳动对工件圆柱表面的加工精度没有影响。

A. 对
B. 错

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主轴回转误差的表现形式有、、三种基本形式。

Lesson 6 短听力选择-1听一遍，选择正确答案

A. due traffic behind
B. due flow control
C. due broken vehicle behind
D. due traffic jam

Lesson 6 短听力选择-2听一遍，选择正确答案

A. facing north
B. facing east
C. facing south
D. facing west

Lesson 6 短听力选择-2听一遍，选择正确答案

A. due ground handling
B. due traffic jam
C. due broken tug
D. due catering delay