问题
单项选择题
()又称系统抽样，是从总体中每隔若干个个体选取一个样本的抽样方法。
A．简单随机抽样法
B．等距抽样法
C．分层随机抽样法
D．分群随机抽样法
答案
参考答案：A
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()又称系统抽样，是从总体中每隔若干个个体选取一个样本的抽样方法。
A．简单随机抽样法
B．等距抽样法
C．分层随机抽样法
D．分群随机抽样法
参考答案：A
People usually talk about two groups of colors: warm colors and cool colors. Warm colors are red, orange and yellow. They usually make people more . For example, red is exciting. Therefore, sociable(好交际的)people, those who like to work with others like . Cool colors are green, blue and purple. These colors can make people . When people are in a place with cool colors, they are usually quiet. People who like to spend time often prefer blue. Scientists say that time seems to pass more slowly in a room with warm colors in a room with cool colors. They that a warm color such as red and orange, is a good color for a restaurant. People who are don’t want time to pass quickly. Cool colors are better for offices or factories, people who work there want time to pass quickly. Scientists don’t know why people think some colors are warm and others are cool. However, almost agrees that warm colors remind people of warm days and cool colors remind them of cool days. Why? Because in the north, the is low and the sunlight looks quite blue during winter. And the sun is higher during summer and the hot summer sunlight looks yellow.
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