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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Contributors in 石炭
Coal
有鉛レギュラーガソリン
エネルギー; 石炭
アンチノック指数(R + M / 2)よりも大きいまたは87に等しいと未満または90に等しいと鉛の0.05グラムまたはガロン当たりリン0.005グラムを含むを持つガソリン。 ...