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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
第一次加熱の代替エネルギー源
エネルギー; 石炭
CBECS (EIA 消費調査)、暖房エネルギー ソースに建物ができたが、領域を大幅に削減加熱し、大幅に温度を低下させることがなく、加熱領域で保持せずメインの暖房装置に大幅な変更なし 1 週間以内に切り替えます。 ...