washed coal 中文意思是什麼
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The technical transformation of the washing technique for ultra - difficultly washed coal
極難選煤洗選工藝的技術改造 -
Talking about the maximum output principle of the washed coal
淺談精煤最高產率原則 -
Coal workings line the route in this hilly, washed out section
煤礦內巷道位於這個多坡的被水沖蝕地區的道路兩旁。
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