预抽室 pre-vacuum chamber ; vacuum chamber
预抽真空泵 forepump ; backing pump ; vacuum booster pump ; vacuum fore pump
预抽泵 backing pump ; backing pump forepump ; forepump backing pump ; forepump
预抽真空室 preevacuated chamber
预抽空泵 fore pump
预抽取 pre-extracting
合理预抽期 rational pre-drainage period
预抽瓦斯 gas pre-drainage
机械预抽真空泵 mechanical pre-vacuum pump
介绍了新研制的预抽真空式可控气氛气体渗碳炉。
A newly developed BBH pre - vacuum - pumping carburizing furnace has been introduced in this paper.
主要介绍了合理预抽期确定模型在焦作矿区的应用。
Application of confirmation model for reasonable pre-draining time is introduced in this paper.
目前，本煤层瓦斯预抽放措施仍然被认为是预防瓦斯灾害最有效的方法之一。
It is considered that the gas pre-extraction measure in coal bed is one of the most effective methods to prevent the gas disaster.
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