从学生表显示所有学生的信息 按照专业的升序排列 专业相同再按照年龄的降序（)。
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从学生表显示所有学生的信息，按照专业的升序排列，专业相同再按照年龄的降序（)。
A．Select * From Student Order by Smajor DESC , Sage ASC
B．Select * From Student Order by Smajor, Sage DESC
C．Select * From Student Order by Smajor, Sage ASC
D．Select * From Student Order by Smajor ASC, Sage
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Select * From Student Order by Smajor, Sage DESC