从物质循环的观点看人体内碳元素的最终来源是 A.食物中的有机物b.非生物界中的碳酸盐c.大气中的二氧化碳d.生态系统中的生产者——青夏 Template




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tomski从物质循环的观点看人体内碳元素的最终来源是 a.食物中的有机物b.非生物界中的碳酸盐c.大气中的二氧化碳d.生态系统中的生产者——青夏 coloring