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用吸水器抽井水为什么要引水

更新时间: 2020-07-05 00:00:00     

1、如果不加水,活塞上下都是空气,气压相等导致无法抽水;

2、压水后,活塞下的空气被一点一点的排出(不加水时,排出一些空气,空气又会从缝隙里重新钻进去),活塞下的气压就越来越小,水面(指地下)上方的大气压可以把水压上来了。

关键词: 井水 为什么 引水

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