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置信水平名词解释

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下列观点哪一个属于决策理论中的内容？()

A. 决策是一个简单的过程
B. 决策即是作程序性决策
C. 决策的行为准则是达到最优
D. 决策不是在最后一瞬间确定

For some people， the negative influence of rapid pace of life is that it can result in highblood pressure and stomach ulcers.
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按测度水平，变量可分为哪几类？举例说明。

If American students do not hand in their assignments before the deadline， they willface the risk of getting low or even no grades for their work.
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