题目内容

Why does the supplier reject the buyer's request for reduction of orders in Dialogue 3?

A. The products the buyer has ordered has been produced totally.
B. The supplier is going to arrange transportation soon.
C. The products the buyer has ordered are customerized(定制的).
D. The supplier may suffer from some losses.

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动力电池组的总电压可以达到:

A. 36~88V
B. 420~500V
C. 90~400V
D. 12~35V
E. :C
F. 程度:中
G. :单选题

电线杆拉线的拉杆螺栓联接,其两端螺纹的旋向( )

A. 正扣
B. 反扣
C. 一个正扣一个反扣

在常用的螺旋传动中,传动效率最高的螺纹是()

A. 三角
B. 锯齿
C. 梯形
D. 矩形

在常用的螺纹联接中,自锁性能最好的螺纹是()

A. 三角
B. 锯齿
C. 梯形
D. 矩形

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