图4 2 8是生态系统中碳循环示意图图中“→ 表示碳的流动方�请据图回答 �在此生态系统中a表示 它所固定的 总量就是流经这个生态 Template




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tomski图4 2 8是生态系统中碳循环示意图图中“→ coloring