下面列出的条目中，哪些是数据库技术的主要特点(23)。

Ⅰ．数据的结构化

Ⅱ．数据的冗余度小

Ⅲ．较高的数据独立性

Ⅳ．程序的标准化

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Viruses can't be transmitted by(74)and(75)is not a common route for virus infiltration.

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Software refers to(70). The most important software on any computer is(71).

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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).

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