煤炭分为几种?煤炭根据热量分为几种?
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![煤炭分为几种?煤炭根据热量分为几种?](/uploads/image/z/12262619-11-9.jpg?t=%E7%85%A4%E7%82%AD%E5%88%86%E4%B8%BA%E5%87%A0%E7%A7%8D%3F%E7%85%A4%E7%82%AD%E6%A0%B9%E6%8D%AE%E7%83%AD%E9%87%8F%E5%88%86%E4%B8%BA%E5%87%A0%E7%A7%8D%3F)
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