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问题 单项选择题

关于局部振动病不正确的是（）

A.是国家法定职业病

B.典型表现是发作性白指

C.电锯伐木可引起

D.也可引起听觉器官的损害

E.限制作业时间是根本预防措施

答案

参考答案：E

单项选择题

成人孤立性主动脉瓣狭窄的常见病因正确的是

A．风湿性炎症

B．先天性二叶瓣畸形

C．感染性心内膜炎

D．类风湿关节炎

E．强直性脊柱炎
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单项选择题

An investor purchased on margin 1000 shares of a stock priced at $ 50 per share. The investor borrowed the maximum amount allowed by the initial margin requirement of 60 percent. The maintenance margin is 30 percent. The lowest price share at which the stock could sell before the investor would receive a margin call is closest to:

A．

A. $15.00.

B．

B. $25.00.

C．

C. $28.57.
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