A.1,2,3,4,5 B.1,2,4,5,7 C.1,3,5,4,6 D.1,3,5,6,7 E.1,3,6,5,7
A.20 B.8 C.16 D.12 E.24
A.MYSQL B.SQL Sever C.Oracle D.金山影霸 E.Foxpro