试题与答案

有三个关系R、S和T如下:则由关系R和S得到关系T的操作是() A.自然连接 B.并

题型:单项选择题

题目:

有三个关系R、S和T如下:

则由关系R和S得到关系T的操作是()

A.自然连接

B.并

C.交

D.差

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: 由“然而”一词可知,文段强调的是其后的内容。文段首先指出儒家的和谐思想与现今提倡的和谐社会理念有所不同,“然而”后指出不能因此而否认儒家思想中仍适用的恒常因素。由此可知,文段强调...

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B The Beatles甲壳虫乐队
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