Equals volume for a specified time period divided by the number of business days within that same time period.
它等于在特定的时期交易量除以同样的特定时期内的工作天数。
Program features: realization of a calendar, when the user specified a certain period of time, it should be, like, made the same calendar format shows all days of the month.
程序功能：实现一个万年历，当用户指定某年某月时，应当像、编日历格式一样显示该月所有日子。
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