试题与答案

凡麻疹疑似病例出疹后多少天内采集的血标本检测麻疹IgM抗体阴性,应采集第2份血标本?

题型:单项选择题

题目:

凡麻疹疑似病例出疹后多少天内采集的血标本检测麻疹IgM抗体阴性,应采集第2份血标本?()

A.4天;

B.2天;

C.3天;

D.28天。

答案:

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参考答案:A解析: 这是道细节题。根据文中第一段的“However, what most people want to know about extinct animals is what they looked like when they were alive. Scientists also w...

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