题目内容

梧桐树协议规范了美国证券市场，关于梧桐树协议，以下说法正确的有

A. 建立经纪人同盟，规定了行业准入门槛
B. 成员间享有股票优先交易权，相当于约定场内交易
C. 规定股票交易的佣金标准
D. 梧桐树协议被后人视为纽约股票交易所的起点

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