下图为生态系统碳循环示意图其中甲乙丙表示生态系统中的三种成分下列叙述正确的是a.x和y代表的生物可分别为乳酸菌和酵母菌b.含碳有机物由 Template




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tomski下图为生态系统碳循环示意图其中甲乙丙表示生态系统中的三种成分下列叙述正确的是a.x和y代表的生物可分别为乳酸菌和酵母菌b.含碳有机物由 coloring