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  • A.修改表5-1的结构,在表5-1中增加一个员工号
  • B.修改表5-2的结构,在表5-2中增加一个部门号
  • C.修改表5-2的结构,在表5-2中增加一个员工号
  • D.修改表5-3的结构,在表5-3中增加一个部门号
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