颈椎骨折导致的四肢瘫患者，训练肩关节充分后伸，有利于进行（）
A.床上运动
B.转移
C.扶拐
D.轮椅上的作业
E.穿戴支具
参考答案：A, B, D
An investor opens a margin account with an initial deposit of $5000. He then purchases 300 shares of a stock at $30. His margin account has a maintenance margin requirement of 30 percent. Ignoring commissions and interest, the price at which the investor receives a margin call is closest to.（）
A. $14.26.
B. $18.72.
C. $19.05.
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