According to the general pattern of ground water lowering, this paper suggested a volume calculation method in the natural river courses in the freezing period.
根据地下水退水的一般规律，提出了针对天然河道封冻期流量推求方法的建议。
By using the method of event study, this paper studies on the reactions of the trading volume and returns around the period of the rename announcement of the stock.
采用事件研究法，对股票更名公告前后市场上的交易量和收益率反应进行研究。
By using the method of event study, this paper studies on the reactions of the trading volume and returns around the period of the rename announcement of the stock.
采用事件研究法，对股票更名公告前后市场上的交易量和收益率反应进行研究。
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