The monitoring on underground coal bed combustion relied on drilling supervising in the past, but this method is not good.
对地下煤层燃烧过去一直依靠钻孔进行监测，未有有效的监测方法。
Internal combustion engines used in machinery for underground works have been removed. They are not machinery, but partly completed machinery.
用于地下工作的机器里的内燃机已经删除了。它们不是机器，而是完整机械的一部分。
The selection of combustion-chamber types of diesel-engines for underground mines is closely related to the performance of the engines themselves.
地下矿用柴油机的燃烧室型式与其主要性能有密切的关系。本文从废气排放、使用经济性以及噪音等方面对比了两类柴油机的优劣。
The selection of combustion-chamber types of diesel-engines for underground mines is closely related to the performance of the engines themselves.
地下矿用柴油机的燃烧室型式与其主要性能有密切的关系。本文从废气排放、使用经济性以及噪音等方面对比了两类柴油机的优劣。
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