脲 urea： 尿素（urea），又称脲、碳酰胺，化学式是CH4N2O或CO(NH2)2 ，是由碳、氮、氧、氢组成的有机化合物，是一种白色晶体。最简单的有机化合物之一，是哺乳动物和某些鱼类体内蛋白质代谢分解的主要含氮终产物。作为一种中性肥料，尿素适用于各种土壤和植物。它易保存，使用方便，对土壤的破坏作用小，是使用量较大的一种化学氮肥，也是含氮量最高的氮肥。工业上用氨气和二氧化碳在一定条件下合成尿素。
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