雨雾天气，汽车电动刮水器和后窗玻璃除雾器对于保证驾驶员具有透明的视野以及保障行车安全具有决定性作用，因此应当加强其维护与检修。

Inspection on window glass maintenance device is one of the common works for vehicle servicemen. The author introduces the maintenance and inspection of electric wiper and rear window defogger.

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介绍了以可编程控制器为核心的高压水除鳞控制系统的工作原理，硬件构成及PLC软件设计。

Introduce the working principle, hardware composition and PLC software design of an iron top-layer removing system with high pressure water based on programmable logic controller.

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分析了水力负荷、气水比、污染物容积负荷对反应器除污效果的影响。

The influences of hydraulic load, air-water ratio, volume load of pollutants on the effect of the removal efficiency were also studied.

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