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问题 单项选择题

患者，男性，55岁，患有胃溃疡10年，突然出现头晕，乏力，心慌，来院急诊，查血常规，发现血红蛋白 50g/L。

输入的库血，贮存日期超过多长时间不能输用

A．1周

B．2周

C．3周

D．4周

E．5周

答案

参考答案：C

单项选择题 A1型题

2型糖尿病的主要死亡原因是（）

A.酮症酸中毒

B.心脑血管病变

C.糖尿病肾病

D.非酮症糖尿病高渗性昏迷

E.感染
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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.

（70）处填（）。

A．limited

B．finite

C．restricted

D．bounded
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