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问题 单项选择题

在PowerPoint 2000中，若为幻灯片中的对象设置“驶入效果”，应选择对话框（ ）。

A．幻灯片放映

B．自定义动画

C．自定义放映

D．幻灯片版式

答案

参考答案：B

填空题

分解因式：x（x﹣2）（x+3）（x+1）+8=　　．
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单项选择题

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.

（69）处填（）。

A．duration

B．period

C．persistence

D．span
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