题目内容

在螺栓紧固件的连接中,被连接件的接触面应制成()或(),且需经机械加工,以保证接触良好。

A. 倒角
B. 退刀槽
C. 凹坑
D. 凸台

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常见的密封装置有哪些?

A. 垫片密封
B. 密封圈密封
C. 填料密封
D. 端盖密封

The number of electoral votes for 50 states and Washington D.C. is ___________.

A. 435
B. 438
C. 535
D. 538

To get elected as the President, a candidate has to get at least __________ votes.

A. 269
B. 270
C. 538

According to the US Constitution, no President is allowed to stay in the White House for more than ________ years.

A. 4
B. 8

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