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CRH2型动车组中差压阀的作用和压差分别是什么？

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计算题：已知工件的长为60mm，宽为50mm，厚为2mm，材料的抗剪强度为320Mpa，求工件的冲裁力是多少？

In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.

A. unscrewing the bulb during the daylight
B. switching the light on only when necessary
C. taking no action as there is no way on saving power
D. taking no action as they shut off automatically in daylight

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哥伦布在（）发现美洲大陆

A. 1492
B. 1519
C. 1522

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牵引力的传递，牵引电动机―主动齿轮一从动齿轮一齿心一传动销一（）―传动销一轮对。

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