氮元素是构成生物体的最主要元素之一在动植物生�活动中起着主要的作用在自然界中各种含氮物质经过复杂的新陈代谢和化学变化而实现氮元素的循环 Template




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tomski氮元素是构成生物体的最主要元素之一在动植物生�活动中起着主要的作用在自然界中各种含氮物质经过复杂的新陈代谢和化学变化而实现氮元素的循环 coloring