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fire coal
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fire coal
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理学
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释
fire coal
燃煤
一种常见的固体可燃有机岩,由古代植物遗体经过生物化学作用和地质作用转变而成,其成分主要有碳、氢、氧、氮等元素组成的黑色或褐色固体矿物。又称煤炭。
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union of projections
union of sets
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union of spaces
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