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【单选题】
对于实体集A和B,实体集A中的每一个实体,实体集B中有一个或多个实体与之联系,而对于实体集B中的每一个实体,实体集A中至多有一个实体与之联系,这种实体集之间的联系称为( )。A.
递归联系
B.
一对一联系
C.
一对多联系
D.
多对多联系
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【简答题】---Is anything _____? ---I can’t decide which dress I shouldwear at my friend’s wedding party. ---I don’t think it ____. A. thematter the matter B. matter matters C. thematter matters D. matter th...
【简答题】句型转换. 1. I can't decide which one I should buy.(改为简单句) I can't decide which one _____ _____. 2. I think the school uniform are very nice . (就划线部分提问) _____ _____ you think about the school uniform? 3. ...
【单选题】I’ve never regretted the _______________ (decide).
A.
decision
B.
decide
C.
decided
D.
deciding
【简答题】根据公式填空：x 2 -______+9y 2 =（x-______） 2 ．
【简答题】设A为三阶方阵, =2,求
【单选题】I decide to leave the company next month, where I ______ for exactly three years.
A.
work
B.
is working
C.
will be working
D.
will have worked
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