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问题 单项选择题

下列哪项属于特异性感染性疾病()

A．破伤风

B．丹毒

C．急性蜂窝织炎

D．疖

E．痈

答案

参考答案：A

单项选择题

该患者最可能的诊断是

A．有机磷中毒

B．一氧化碳中毒

C．误服不洁食物

D．误服强酸溶液

E．酒精中毒
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单项选择题

John McHenry is a junior consultant working in Oldie Village Pension Consulting. He has calculated annual returns for 300 portfolio managers, and is analyzing the relationship between fees and performance. The dataset he is using (returns and fees for each manager) is an example of:

A．

A. a stratified random sample.

B．

B. a normalized dataset.

C．

C. a cross-sectional dataset.
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