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问题 多项选择题

患者女，28岁。确诊为系统性红斑狼疮1年余，给予强的松治疗。1周前外出后出现发热，T38.2℃，面部及全身多处皮疹，伴关节疼痛。判断系统性红斑狼疮活动性的指标有（）。

A.蛋白尿、血肌酐升高

B.癫痫发作、精神异常

C.白细胞数增加

D.电解质紊乱

E.血沉加快

答案

参考答案：A, B, E

填空题

一名成年乘客只可免费携带一名身高不足（）的儿童乘车，超过一名的，（）。学龄前儿童不得（）。
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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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