两元经纪人
参考答案：
又称专家经纪人，是专门接受佣金经纪人再委托，并代为买卖，收取一定的佣金。
Which of the following statements about trading shares of stock or market efficiency is FALSE（）
A. Maintenance margin is the required percentage of an investor’s equity compared to the total value of the stock after the investor trades on margin.
B. The up tick rule requires that the last trade in the security be at a price higher than the previous trade.
C. External efficiency means prices adjust rapidly to new information.
STC.算子方法是指我们可以从物体的（）三个方面来重新思考问题，打破固有认识。
A.尺寸
B.资源
C.时间
D.成本
