下列借记卡业务中，必须在发卡行所在地任意营业机构办理的是（）。
A. 换卡
B. 书面挂失
C. 销卡
D. 密码挂失
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After being launched from a vessel，totally enclosed survival craft which have been afloat over a long period require（）.
A. frequent opening of hatches to permit entry of fresh air
B. regular checks of bilge levels
C. use of ear plugs to dampen engine noise
D. frequent flushing of the water spray system with fresh water
被省委组织部列为立项督查的问题，承办单位要认真调查核实，一般应在多少日内报告查核结果？
下列转速中（）r/min为4极异步电动机的额定转速。
A. 975
B. 1000
C. 495
D. 1475
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