投资组合保险策略在市场变动时的行动方向是()。
A.下降时买入
B.上升时卖出
C.下降时卖出
D.上升时买入
参考答案:C, D
—Let’s go to the concert this evening.It’s said to be excellent.
—I’d like to,but I have something to do.
—_________!It is the last time.We’ll have no chance to enjoy it.
A.What a pity
B.Not at all
C.All the best
D.Never mind
下列哪项可鉴别肝内胆管结石与积气()
A.沿肝管分布
B.胆管扩张
C.形态不稳定、可移动
D.有手术史