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A.概念結(jié)構(gòu)設(shè)計(jì) B.數(shù)據(jù)庫實(shí)施 C.邏輯結(jié)構(gòu)設(shè)計(jì) D.數(shù)據(jù)庫運(yùn)行和維護(hù)
A.小數(shù)點(diǎn)后邊有10位數(shù)字,小數(shù)點(diǎn)前邊有4位數(shù)字 B.小數(shù)點(diǎn)后邊有4位數(shù)字,小數(shù)點(diǎn)前邊有10位數(shù)字 C.小數(shù)點(diǎn)后邊有4位數(shù)字,小數(shù)點(diǎn)前邊有6位數(shù)字 D.小數(shù)點(diǎn)后邊有4位數(shù)字,小數(shù)點(diǎn)前邊有5位數(shù)字