7）表面冲洗(surface wash)：在过滤含有机物质较多的原水时，滤层表面往往生成由滤料颗粒、悬浮物和粘性物形成的泥球。
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... Wet crocking湿磨 Surface wash表面清洗 Hand wash手洗 ...
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surface wash pump 表洗泵
surface wash pump coupling 表洗泵连轴器
Surface wash test 表面冲洗试验
surface wash sweep 表面扫洗
surface wash of filter 滤池表面冲洗
air-entrained surface wash sweep 加气表面冲洗扫除
First, after touching a surface that could be contaminated, wash your hands thoroughly.
FORBES: Magazine Article
With the sun setting, the sky is etched with a calligraphy of pink clouds, their reflection a soft wash on the river surface.
CNN: Bradley's twilight cruise
Then, when snow or rain wash them onto an ice floe, they darken its surface and thus cause it to melt faster.
FORBES: Soot and CO2 In The Arctic
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