绝经后女性骨质疏松是由于雌激素不足导致（） A.骨质生成停止 B.血钙降低

Perce Blackborow and his companions stayed on Elephant Island for six months before rescue came, so they ________ a lot of difficulties.

A．must go through

B．may go through

C．must have gone through

D．could have gone through

The reason ____the little actress has been such a success is ____she is both clever and hard-working.

A．why, why

B．why, that

C．that, because

D．for, because

胃术后近端空肠段逆流

A．呕吐物为食物，无胆汁
B．呕吐物为胆汁，无食物
C．呕吐物既有胆汁，又有食物
D．呕吐物呈酸臭味，有宿食
E．无呕吐

什么是铠装热电阻？

确定证券投资政策涉及到的流程是( )。

A．决定投资收益目标、投资资金的规模、投资对象以及采取的投资策略和措施
B．对投资过程所确定的金融资产类型中个别证券或证券群的具体特征进行考察分析
C．确定具体的投资资产和投资者的资金对各种资产的投资比例
D．投资组合的修正和投资组合的业绩评估