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1、质量度的概念首先我们要了解百度推广中质量度的概念，质量度是关键词的一项属性，它是百度推广系统根据关键词的创意质量、点击率、账户结构、帐户历史表现等多种因素计算得出的值。

6、直流电动机直流电动机具有调速性能好、起动容易、能够载重起动等优点，所以直流电动机的应用仍然很广泛，尤其在可控硅直流电源出现以后。

当除尘器过滤阻力会上升，此时可选择停机，休息时间进行人工清理。

另外，汽油机排气温度比柴油机高，而且不宜采用加大气门重叠角（进、气排门同时开启的时间）方式来加强排气的降温，降低压缩比又会造成燃烧不充分。

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V锥流量计与其它差压式流量仪表原理相同，也是一种节流式差压流量计，都是遵循封闭管道中流体质量守恒（连续性方程）和能量守恒（伯努利方程）定律。

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