题目内容

Additives are expensive but are used in very low ____.

A. concentration
B. concentrations
C. percent
D. contain

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The choir stood in four rows according to their ____ heights.

A. respectable
B. respectful
C. respective
D. respected

制动盘加工时，加工了

A. 内孔
B. 端面
C. 螺纹孔
D. 退刀槽

如果车床主轴与地面垂直，为

A. 卧式车床
B. 立式车床

进给量0.28mm/r意思是

A. 工件每旋转一圈，刀具直线运动0.28mm
B. 工件每mm旋转0.28圈
C. 工件移动每0.28mm，刀具旋转一圈
D. 工件转动每0.28mm，刀具旋转一圈