回答题                              B  Not many years ago,a wea

回答题                              BNot many years ago,a wealthy and rather strang

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有三个关系R、S和T如下: 关系R和S通过运算得到关系T,则所使用的运算为(  )。

有三个关系R、S和T如下: 关系R和S通过运算得到关系T,则所使用的运算为(  )。 A.笛卡儿积 B.交 C.并 D.自然连接

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A fight broke out among the football fans and soon it went_

A fight broke out among the football fans and soon it went__________control.A.u

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完成题                                  CThe home computer ind

完成题                                  CThe home computer industry has been grow

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All the people around were affected________tears by the sig

All the people around were affected________tears by the sight. A.for B.in C.to

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