设关系R和关系S具有相同的元数,且对应的属性取自相同的域。集合{tlt∈R∧t∈S}标记的是(21)。
(68)
(66)
Viruses can't be transmitted by(74)and(75)is not a common route for virus infiltration.
(64)
Software refers to(70). The most important software on any computer is(71).
(62)
CPU doesn't mean(68). On a large computer system, a(69)links external devices to a channel.
Modern computers are electronic and(66)devices. The basic building block of a modem computer is a(67).
(60)
(59)
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