试题与答案

5岁男孩,2个月前患麻疹后经常发生呼吸道感染。体检无阳性发现。血常规∶白细胞5×10

题型:单项选择题

题目:

5岁男孩,2个月前患麻疹后经常发生呼吸道感染。体检无阳性发现。血常规∶白细胞5×109/L,中性粒细胞0.4,淋巴细胞0.6;CD3细胞50%,CD4细胞35%,CD8细胞25%;血清IgG1.2/L,IgM0.6/L,IgA0.3/L。其可能的诊断为()

A.中性粒细胞减少症

B.选择性tsar缺陷病

C.正常儿

D.继发性免疫缺陷病

E.原发性T细胞免疫缺陷病

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:样本中元素个数与总体中元素个数的比率,即样本规模与总体规模的比率称为抽样比率。

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下列程序的输出结果是

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A.m and n:6 8

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