An analog signal’s characteristic quantity representing data may(66). at any instant, any value within a continuous(67). For exa

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问题 An analog signal’s characteristic quantity representing data may(66). at any instant, any value within a continuous(67). For example, an analog signal may follow continuously the values of another physical quantity representing data.A discrete signal is composed of(68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform,(69), and position in time. A digital signal is a special case of discrete signals, in which data are represented by a(70) number of well-defined discrete values that one of its characteristic quantities may take in time.

选项 A、limited
B、finite
C、restricted
D、bounded

答案C

解析 一般来说,“字符”是用于对数据进行表示、组织或控制的元素集合中的一个成员。字符可分为“图形字符”与“控制字符”两大类。与控制字符不同的是:图形字符由其视觉表示,正常情况下通过写出、打印或显示产生。图形字符包括数码字符、字母字符、表意字符和专用字符。控制字符出现在某一特定上下文中,以此规定某一控制功能。控制字符包括传输控制字符、格式控制字符、代码扩展字符和设备控制字符。可将一个控制字符记录下来,供后续动作使用。控制字符虽然不是图形字符,但在某些情况下可以由某种图形表示。
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