Usually, there are two technical routes: direct coal liquefaction and indirect coal liquefaction.

煤制油技术主要有煤炭直接液化和煤炭间接液化两类。

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Usually, there are two technical routes: direct coal liquefaction and indirect coal liquefaction.

煤制油技术主要有煤炭直接液化和煤炭间接液化两类。

youdao