The varying law of the final volatile yield of 18 different coal types was studied at different heating rates by thermobalance.
采用热天平在不同的升温速率下对18种煤的最终挥发分产量的变化规律进行了研究。
There are two different types of coal – in fact two different types of demand – when it comes to the coal market.
煤炭市场存在着两种不同类型的煤炭，事实上就是两种不同类型的需求。
There are different types of coal.
煤有很多不同类型。
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