单项选择题

In chapter 5, according to Professor Hansen's bell-shaped curve of average temperature, what does three standard deviations mean for temperature?

A．Moderate heat or cold that occurs regularly
B．Extreme heat or cold that occurs a couple of times in a thousand occurrences
C．Slight heat or cold that occurs in twelve times in a thousand occurrences
D．Normal heat that occurs normally

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答案：正确

In chapter 5, according to Professor Hansen's bell-shaped curve of average temperature, what does three standard deviations mean for temperature?

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引水建筑物的作用是为水轮发电机组输送发电用水。 正确 错误

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正确
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