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【多选题】
投票者决定投票还是不投票，主要受（）等因素的影响。
A.
MB是否大于T
B.
参与投票的成本
C.
投票行为对选择结果影响的程度
D.
交通是否便捷
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A.
选择
B.
连接
C.
投影
D.
交叉
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A.
妊12～14周
B.
妊18～20周
C.
妊24～28周
D.
妊30～32周
E.
以上都不是
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A.
100
B.
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C.
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【单选题】Do you know _____? [     ]
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【单选题】将两个关系拼接成一个新的关系,该关系中包含满足条件的元组,这种操作称为()。
A.
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A.
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B.
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