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问题 单项选择题

某医生想把在研究某新药的治疗效果时收集到资料（见下表）绘制成疗效构成统计图，宜选用某新药治疗效果（）。

A．复式直条图

B．网图

C．单式直条图

D．直方图

E．普通线图

答案

参考答案：B

单项选择题

最早记载常山和蜀漆治疟的著作是

A．《千金要方》
B．《神农本草经》
C．《本草纲目》
D．《新修本草》
E．《金匮要略》
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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.

（67）处填（）。

A．interval

B．region

C．range

D．compartment
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