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【单选题】
在SQL语言中,授权命令关键字是____________。
A.
GRANT
B.
REVOKE
C.
OPTION
D.
PUBLIC
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A.
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D.
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A.
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B.
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C.
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D.
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【简答题】默认情况下Word的纸型是()。
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【单选题】CRH1受电弓静态接触力调整的平均值为()。
A.
30N
B.
70N
C.
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D.
50N
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A.
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B.
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