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问答题
简述User Equilibrium(用户平衡)的基本假设?
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假设数据库中创建了一个用户test,状态为锁定状态,需要使用SQL语句解除锁定,可以使用如下()语句。
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The moisture equilibrium chart can be used to determine the ______.A.Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium existsB.Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodityC.Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargoD.Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo
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单选题执行下列 SQL 语句之后: GRANT ALL PRIVILEGES ON TABLE student TO USER user1 假设用户USER1没有其他权限,下列哪一项操作是USER1可以执行的?()A
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单选题The moisture equilibrium chart can be used to determine the().A
Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium existsB
Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodityC
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Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo
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单选题假设需要删除数据库中的某个用户test,可以使用如下()语句。A
DELETE USER testB
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名词解释题Hardy-Weinberg平衡(Hardy-Weinberg equilibrium)
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