开展投资保险业务的主要目的是（）。
A.保障投资者的利益
B.分散投资风险
C.有利于引入资金
D.鼓励资本输出
参考答案：D
Never______ such a difficult problem. It took me almost half an hour to work it out.
A．had I come across
B．I had come across
C．did I come across
D．I did come across
房颤病人应用洋地黄时心室率减慢至5次／分时（）
A.停用洋地黄制剂加用钾盐
B.停用洋地黄制剂加用普鲁卡因酰胺和钾盐
C.停用洋地黄制剂加用阿托品
D.试用小剂量西地兰静脉推注
E.停用洋地黄制剂观察
