顶板瓦斯高抽巷的抽采效果与抽放负压直接相关。
The gas extraction effects is related to negative pressure of suction.
介绍了高瓦斯采煤工作面采用高抽巷抽放、尾抽巷抽放等专用巷道瓦斯抽放技术，解决了工作面初采期间的瓦斯问题。
Introduces the roadway gas drained technology for high gas mining face, it has resolved the gas control problems during primary mining face.
站得和埃菲尔铁塔一样的高，帕迪多油井通到了海底2400米深处，而能抽到石油的最深点是海底2900米。
Standing nearly as tall as the Eiffel Tower, it is chained to the seabed 2.4km metres below and is capable of extracting oil at a maximum depth of 2.9km.
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