单项选择题

美国是商业医疗模式的典型代表。目前美国形成了以商业医疗为主，社会医疗保险为辅的多元化医疗保障体系。

A．对
B．错

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单项选择题

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单项选择题

A standard normal distribution is a normal distribution with:
A. a mean of zero and a standard deviation of one.

B. a mean of one and a standard deviation of zero.

C. a mean usually larger than the standard deviation.

D. a mean always larger than the standard deviation.