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问题 单项选择题

推力球轴承装配时，、一定要使紧圈靠在（）的平面上。

A.转动零件

B.静止零件

C.任意零件

D.大的零件

答案

参考答案：A

判断题

股票市场中的“死亡交叉”是指短期移动平均线向上突破长期移动平均线形成的交叉。( )
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选择题
They ______ on the program for almost one week before I joined them, and now we  _______ on it as no good results have come out so far.

A. had been working; are still working  
B. had worked; were still working
C. have been working; have worked    
D. have worked; are still working
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