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The coal accumulation process took place during their certain periods.
聚煤作用发生在特定的演化阶段。
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The heat accumulation plays key role in coal self-ignition.
热量的积聚在煤自燃过程中起着关键的作用。
youdao
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The heat accumulation plays key role in coal self-ignition.
热量的积聚在煤自燃过程中起着关键的作用。
youdao