生态系统中的物质可以循环利用右图表示生物圈中碳元素的循环过程下列有关叙述正确的是 A.温室效应主要是由�过程造成的 b.b是生产者�过程 Template




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tomski生态系统中的物质可以循环利用右图表示生物圈中碳元素的循环过程下列有关叙述正确的是 a.温室效应主要是由�过程造成的 b.b是生产者�过程 coloring