中国市场关于融券的法规相对美国市场的做空，有什么区别？

中国市场关于融券的法规相对美国市场的做空，有什么区别？

我有两个问题1）美国有没有关于比如说融券余额占流通市值的多少比例或以上后，停止融券做空的？2）关于Alternative Uptick Rule The alternative uptick rule, as adopted, provides that a circuit breaker is triggered with respect to a stock if the stock’s price declines by 10% or more from the prior day’s closing price. At that point, short selling in the stock is permitted only if its price is above the current national best bid. Once triggered, the circuit breaker remains in effect with respect to the stock for the remainder of the day and for the following day. The alternative uptick rule generally applies to equity securities listed on a national securities exchange, whether traded on an exchange or on the over-the-counter market. The SEC noted that, under the rule, trading centers would be required to establish, maintain, and enforce written policies and procedures reasonably designed to prevent the execution or display of a prohibited short sale.这个意思好像和楼主说的，“b. 一旦做空熔断被触发，则当天和其后一天该股票都将被禁止做空。”不太一样啊。。。

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