The main work and administration of this machine is constant pressure extraction.
本机主要工作及管理是定压抽气。
The gas extraction effects is related to negative pressure of suction.
顶板瓦斯高抽巷的抽采效果与抽放负压直接相关。
It was found that 78% zinc extraction was obtained at room temperature and atmosphere pressure.
试验结果表明：在常温常压下，用硫酸浸出该氧化锌矿石锌的浸出率可达到78%。
The higher separating of pressure was, the lower the rate of extraction was.
分离压力升高，萃取率呈下降趋势。
The higher separating of pressure was, the lower the rate of extraction was.
分离压力升高，萃取率呈下降趋势。
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