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问题 单项选择题

TSG3-630／25型单臂受电弓静态接触压力试验中：传动风缸供风，上铰链上挂一重量80N的重物让受电弓从2.25m的升弓高度开始，通过调节无初始速度的释放，受电弓应能自行下降到（）的高度。

A、0.3m

B、0.4m

C、0.5m

D、0.6m

答案

参考答案：C

选择题

-I want to win first prize in the coming school math competition.

-__________.[ ]

A. What's it about?

B. I bet you do!

C. Nice work!

D. I'll see to that
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选择题

---Could you tell me _____?

---About two months.

A．when are you leaving for Shanghai

B．how often you go to the school library

C．how many tickets have you booked

D．how long you have been at this school
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