SoftX3000满配时最多能够配置（）块CKII板。
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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
哥伦布在（）发现美洲大陆
A. 1492
B. 1519
C. 1522
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