赞题库-背景图

单项选择题

All the Four Great New Innovations of China mentioned in this chapter were created by Chinese people.（）

A．对
B．错

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热门试题

单项选择题A simple random sample assures that:‏

A．the sample will be at least 30 observations.
B．the sample will be biased.
C．the sample size will be equal to the population size, N.
D．all items in a population have an equal probability of selection.

单项选择题Cambridge’s language center was founded in ____. A、1990 B、1960 C、1900