Methods: Were proposed to prevent air entrainment.

同时提出了充模过程中防止气泡卷入的措施.

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Additional, station of gas station, air entrainment is 20 years with the ground.

另外, 加油站 、 加气站用地为二十年.

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Overflow weir is used to control water hammer and prevent air entrainment in long supply pipelines.

在长距离输水管路出口设置溢流堰可以有效控制水击和防止管路脱空.

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