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沥青
一个通用的术语适用于那些自然易燃物质,该物质颜色、硬度可变,具有挥发性,主要由从含氧机体中得到的碳氢化合物的混合物组成。沥青有时候和矿物质相联系,易燃的,可大量融于二硫化碳(水不溶性磺化产品)的非矿物质的成分。石油,沥青,天然矿物蜡及沥青柏油都被认为是沥青。
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