英语词汇“medium rank coal”的意思、用法、释义、翻译、读音、例句、短语、词组-英汉翻译词典

单词	medium rank coal
释义	medium rank coal 中煤阶煤; 国际煤层煤分类中,镜质组平均随机反射率小于2.0%,且含水无灰基高位发热量不低于24MJ/kg的煤。
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