煤焦沥青Coal tar：煤焦沥青是炼焦的副产品，即焦油蒸馏后残留在蒸馏釜内的黑色物质。
Coal tar is a by-product of coking, namely tar distillation residue in distillation kettle black material.
煤焦沥青Coal tar：煤焦沥青是炼焦的副产品，即焦油蒸馏后残留在蒸馏釜内的黑色物质。
Coal tar is a by-product of coking, namely tar distillation residue in distillation kettle black material.
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