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【单选题】
有两个关系R和T如下: 则由关系R得到关系T的操作是A.
交
B.
并
C.
选择
D.
投影
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【单选题】When her husband laughed at her reaction, Isabel decided ______.
A.
to hit her husband with a slipper
B.
to carry on calmly with what she was doing
C.
to pull herself towards the chair she was standing on
D.
to calm down and behave sensibly
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