创办了世界上第一所护士学校的是（）。
A.希波克拉底
B.阿维森纳
C.塞尔维特
D.南丁格尔
E.野口英世
参考答案：D
开立机构交易只能由（）操作，并要8级柜员授权，否则会提示交易失败。
A.省中心
B.市联社
C.区联社
D.营业部
Which of the following characteristic of perfect competition explains why firms in perfect competition are referred to as price takers（）
A. Each firm is small relative to the total market.
B. The demand curve is horizontal for firms in perfect competition.
C. There are many independent firms.
