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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.
Industry: Energy
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Coal
住宅能源消費調查 (區域經濟共同體)
Energy; Coal
全國多級概率進行的抽樣調查由能源最終用途司能源資訊管理。區域經濟共同體提供比較基準資訊,美國家庭如何使用能源。住宅交通能源消費調查 (RTECS) 示例是一個子集的區域經濟共同體。 在區域經濟共同體個人面試期間收集的家庭人口特徵報告 RTECS ...