quarter coal 中文意思是什麼
quarter coal
解釋
售給礦工用的煤-
Analysis of grouting treatment in the gob area of tienan residential quarter in gushuyuan coal mine
古書院礦鐵南住宅小區采空區的注漿處理分析 -
Cinese coal output makes up 40 percent of the world coal output, coal output of shanxi accounts for about a quarter of that of china
中國的煤炭產量約佔世界煤炭產量的40 % ,山西的煤炭產量約佔全國煤炭產量的1 / 4
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