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功率谱的初步估计一定是无偏估计。()

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When bilge water is heated in a holding tank, which one of the following statements is not

A. The high temperature facilitates primary gravity separation
B. Most of the oil and organic solvents are raised to the top layer
C. The high the temperature is, the more the top oil will be collected
D. The high temperature has little use on the separation of emulsified oil

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功率谱的初步估计一定是无偏估计。()

When bilge water is heated in a holding tank, which one of the following statements is not

为提高刚度和抗振性,有的机床主轴采用三个支承,一般这三个支承可以都是主要支承。()

普通机床通常采用三相异步电动机。()

在实践中,可以获得理想的单位脉冲输入。()