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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
白熾燈，包括定期或高效節能燈泡
Energy; Coal
白熾燈是 electriclight 的一種類型光 electriclight 的由電流加熱絲。最常見示例是您在大多數表和地板燈中找到的類型。在商業樓宇、 白熾燈用於顯示燈在零售商店、 旅館和汽車旅館。這包括用於顯示商品或提供現貨的照明設備，在食肆的非常小，高強度軌道燈。能源效率的燈泡，稱為"瓦儲戶"使用更少的能源比標準的白熾燈。"長壽"燈泡，比白熾燈的標準，但相當少的光線，產生更長的燈泡，不考慮 ...
