机床主轴回转误差是从车削外圆表面的每一个截面内,主轴瞬时回转中心与刀尖位置的变化来分析。
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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
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