煤是由_________________组成的复杂混合物,主要含_______________元素,还

煤是由_________________组成的复杂混合物,主要含_______________元素,还含有少量___________________等元素。煤的综合利用是通过_______________、_____________和________________,获得多种洁净的燃料和_____________________。

答案

有机物和少量无机物  碳  氢、氧、氮、硫  干馏  液化  气化  多种化工原料

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