When he was a post office clerk, secretaries were better paid because ______.
A.they were in shortage
B.they were better trained
C.they worked longer hours
D.they had greater responsibility
第6题
在测量减速器齿轮啮合间隙时,应固定减速器主动齿轮,使其不能转动,将百分表头垂直接触减速器()的齿侧面,并往复转动被动齿轮。
A.主动齿轮
B.被动齿轮
C.锥齿轮
D.壳体
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