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丹参所没有的药理作用是（）
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生长素极性运输的机理是怎样的？
作家许某2011年12月完成一部长篇小说，在某报刊上连载登出，该报社分三次付给稿酬，第一次付3500元，第二次付6500元，第三次付2000元。随后该小说被出版为小说发行，作家又取得稿酬15000元。请计算该作家应缴纳的个人所得税。
宏汇编语言程序被汇编时，指令语句产生（），伪指令语句不产生代码指令，宏指令语句可能产生也可能不产生代码指令。
You recently took over as the Exchange 2010 Server Administrator for Xxx .The previous administrator allowed users to pick the email addresses of their choice.This caused much confusion， as each user wanted a different email address.You want to standardize the emails addressed across the entire organization.You have determined that the naming convention will be the first letter in their first name and then their last name.For example， the e-mail address for John Smith would be jsmith@Xxx .What should you do to enforce this standard？（）
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