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问题 单项选择题

双黄连口服液的功能是

A．清热解毒
B．疏风清热，宣肺止咳
C．疏风清热，发表宣肺
D．疏风解表，清热解毒
E．祛风解表，化湿和中

答案

参考答案：D

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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填空题

正常情况下，砂泥岩剖面中储集层的电性特征主要表现为自然电位（），自然伽马（），微电极（），井径（）钻头直径。
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