Coal is divided into 5 categories according to their properties and the proportions of carbon element by sorting the quantity of carbon in the rock taken from low to high as follows: p Thu nat Miss bikini lining lignite was centered around two Minas and anthracite.
Coal is divided into five categories based on their properties and compositions of carbon. By volume of carbon in taking stones from low to high as follows peat, lignite, sub bituminous Miss Nasser. Bituminous and anthracite.
Coal is divided into 5 types according to properties and composition of carbon. In the order quantity of carbon in taking the stone of ascending as follows: Pete lignite sub บิทู Miss bituminous and anthracite, the NUS