This paper points out that a gear's surface quality has important influence on its employment performance, and pulse-electrochemical mechanical finishing in gear machining is discussed in detail.

提出齿轮的表面质量对其使用性能和寿命有着极为重要的影响，并详细论述了脉冲电化学机械齿轮光整工艺，及其加工后的齿轮的表面质量特性。

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All components and the principle of the power quality detecting system are introduced in detail in this paper.

对电能质量检测系统的组成部分和工作原理进行了详细介绍。

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The critical points of quality control in the chemical laboratory were summarized in the paper, including internal and external quality control, and internal one was analysed in detail.

概述了化工实验室质量控制的关键要素，包括内部质量控制和外部质量控制，并对内部质量控制进行了详细分析。

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