This paper introduced the principle of AC-contactor working without noise and offered two series electrical controlling circuits.

本文分析了交流接触器无声运行的工作原理，提出了两类电气控制线路。

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This paper introduced the principle of AC-contactor working without noise and offered two series electrical controlling circuits. It is a practicable and energy-saving technology.

本文分析了交流接触器无声运行的工作原理，提出了两类电气控制线路。这是一种实用的节能技术。

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