若对表2-12按()进行运算,可以得到表2-13。 https://assets.asklib.com/psource/2016091808455831529.gif https://assets.asklib.com/psource/2016091808462925748.gif

A .https://assets.asklib.com/psource/2016091808464390481.gif B .https://assets.asklib.com/psource/2016091808464727700.gif C .https://assets.asklib.com/psource/2016091808465346673.gif D .https://assets.asklib.com/psource/2016091808465787320.gif

时间:2022-10-01 16:23:21 所属题库:数据库系统题库

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