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【单选题】
当对关系R和S进行自然连接时,要求R和S含有一个或者多个共有的()。A.
记录
B.
行
C.
属性
D.
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举一反三
【单选题】The virus is transmitted most commonly through ______.
A.
programs sent by modem
B.
shrink-wapped retail software
C.
piracy of software
D.
the use of floppy disks
【简答题】设a=0x54=01010100B,b=0x3b=00111011B,则a&b=____B。
【简答题】设a=0x54=01010100B,b=0x3b=00111011B,则a|b=____B。
【简答题】Questions 36 to 40 are based on the following passage. Now custom has not been commonly regarded as a subject of any great importance. The inner workings of our own brains we feel to be uniquely worth...
【简答题】If you’re a common user of computer, are video card and sound card the most commonly seen parts?
【简答题】要准确地描述、介绍客房,必须首先______________________,这也是对前厅服务人员最基本的要求之一。
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