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问题 多项选择题

施工前认真检查施工地点的工作环境，避免损伤（）。

A、管线

B、电缆

C、其它设施

D、水沟盖板

答案

参考答案：A, B, C, D

单项选择题

男，24岁，全身水肿1个月。查血压160/95mmHg，尿蛋白+++，RBC+/HP，ALB20g/L，G1B30g/L，BUN10mmol/L，Cr180μmol/L。下列哪项可能性大（）

A.慢性肾炎

B.急进性肾炎

C.高血压病肾损害

D.肾病综合征

E.急性肾炎
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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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