题目内容
规范分析法是以一定的价值判断为基础，提出分析问题的理论标准，并研究如何才能符合这些标准。
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边际是指自变量发生微小变动时，在边际上因变量的变化率。
航空公司有时会推出低于平均价格的特价借票，例如星期六夜晚特价机票或最后一分钟特价机票。这种行为使用了边际思维。
Writing ：Directions: SiHai fitness center is looking for an intern to join its team. Write an advertisement for an intern. Remember to inclde:the wage;the work time;the skills needed;benefits of doing the internship;contact information.LOOKING FOR PERSONAL TRAINERSCome and work at_______1______!Why not spend your time helping people to achieve their fitness goals?Skills needed:You’ll:Hours of work: _________3___________Salary: _________4___________Experience is not required as training will be given.Contact__________5____________.备选项A.working as part of a teamB.$10 per hourC.Mark@gofitnessfor more information.D.our fitness centerE.3 days a week for six months
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