题目内容

Job losses are an unfortunate _____ of the recession.

A. byproduct
B. product
C. result
D. outcome

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Additives are expensive but are used in very low ____.

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

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