单项选择题

IPv4地址有()位。

A.4
B.8
C.16
D.32

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单项选择题
M: Haven’t you finished the book yet?W: Almost. I’ve only one-fifth of the pages left.Q: How many pages has the woman read?()

A.Half
B.Four-fifths
C.One-fifth
D.Fifty-one

单项选择题
关系数据模型中,与二维表中的”列“的对应的术语是()。

A.属性
B.关系
C.域
D.元组

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