| 释义 |
煤méi矿物,黑色固体,主要成分是碳、氢、氧和氮。是古代植物体在不透空气或空气不足的情况下受到地下高温高压而形成的。按形成阶段和炭化程度的不同,可分为泥煤、褐煤、烟煤和无烟煤。主要用做燃料和化工原料。{coal; black solid mineral mainly consisting of carbon, hydrogen, oxygen and nitrogen; formed by ancient carbonized plants that have been subjected to high, subterranean temperature and pressure in anaerobic conditions, subdivided into peat, brown coal, soft coal and anthracite, according to different periods of formation and degrees of carbonization, mainly used as fuel and chemical material;}也叫also煤炭{méitàn}。 |