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问题 单项选择题

下列与腭护板有关的叙述，哪一项是错误的（）

A.腭护板要覆盖并超过缺损腔

B.腭护板可以进入缺损腔

C.手术后6-8天摘下腭护板和敷料，清洗伤口和腭护板

D.夜间也可以戴腭护板

E.腭护板需要经常重衬

答案

参考答案：B

单项选择题

根据《水法》规定，在河道管理范围内铺设跨河管道、电缆属于( )

A．禁止性规定
B．非禁止性规定
C．限制性规定
D．非限制性规定
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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.

（68）处填（）。

A．sequent

B．contiguous

C．following

D．successive
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