Coal farar, gajere ne don farar kwal ɗin kwal, sarrafa kwal ɗin kwal bayan cire ragowar ruwa na distillate, na wani nau'in kwalta ce ta wucin gadi, gabaɗaya don ruwa mai ɗanko, mai ƙarfi ko ƙarfi, baki da haske, gabaɗaya yana ɗauke da carbon 92 ~ 94%, hydrogen kusan 4 ~ 5%. Kwal...
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