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问题 选择题

辛亥革命的指导思想是 [ ]

A、民主共和

B、三民主义

C、自强求富

D、师夷长技以制夷

答案

答案：B

填空题

妊娠期龈炎在（）和牙龈 * * （前牙区）。
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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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