题目内容

无缝线路固定区长度不得短于()。

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某曲线半径为400m，则圆曲线正矢为()。

What shall we do if we suspect the identity of a journalist？

Ask him/ her to hold on and call to the reception desk to check the identity.
B. Ask him/ her to wait a minute and check his/ her passport and visa
C. Ask him/ her to wait a minute and consult “Who is who”.
D. Ask him/ her to wait a minute and call to the information center to check the identity.

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钨极氩弧焊采用接触引弧是产生()的原因之一。

A. 焊瘤
B. 夹钨
C. 咬边
D. 未焊透

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做好时间管理的最佳策略是高效执行。()

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