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  3. The major goal of USB was to define an external expansion bus which makes adding(71) to a PC as easy as hooking up a telephone t

The major goal of USB was to define an external expansion bus which makes adding(71) to a PC as easy as hooking up a telephone t

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问题 The major goal of USB was to define an external expansion bus which makes adding(71) to a PC as easy as hooking up a telephone to a wall-jack. USB 2.0 is an evolution of the USB 1.1(72), providing a higher performance interface.
选项 A、protocol
B、specification
C、prescript
D、rule
答案B
解析 USB的主要目的是用来定义外部扩展总线，使外设添加到PC上变得更加容易，就如装配一个电话到墙壁插座上一样。USB 2．0是USB 1．1规格的升级，它提供一个高性能的接口。
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