贷款金额不得超过抵押品价值的（）。
A.50%
B.60%
C.70%
D.75%
参考答案：C
He doesn't know_____ to hand in the homework. I think he may do it tomorrow.[ ]
A. where
B. what
C. which
D. when
下列可引起中心性紫绀的疾病是（）
A.右心衰竭
B.肺淤血
C.缩窄性心包炎
D.重症休克
E.血栓闭塞性脉管炎
