low coal seam [矿业] 薄煤层 ; 夹有薄煤层
low ash coal 低灰分煤
low-coal 极薄煤层
low grade coal 劣质煤 ; 低品位煤
low coal bed 低煤层
low-coal seam 薄煤层
gently inclined low coal seam 缓倾斜薄煤层
low rank coal 低煤阶煤 ; 低煤化度煤 ; 低阶煤 ; 低煤级煤
The Ca-based matter in coal was beneficial to sulfur fixation, and low coal ash fusibility was disadvantage to fixation sulfur.
煤中所含钙基组分对固硫有利，石灰石对低灰熔点煤高温固硫不利。
There have been some problems such as low coal recovery and difficult management after coal mining in steep seam mining method.
急倾斜煤层的回采一直存在着回采率低、采后难以管理等实际问题。
A high or low coal recovery rate of the top coal caving mining is related to the key technology of the coal mining method to be widely applied.
放顶煤开采煤炭回收率的高低是关系到能否推广这种采煤方法的关键技术。
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