下图表示一个能够自�维持稳定的生态系统必须满足的条件则字母x最可能代表 a.生物因素 b.共生关系 C.非生物因素 D.物质循环——青 Template




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tomski下图表示一个能够自�维持稳定的生态系统必须满足的条件则字母x最可能代表 a.生物因素 b.共生关系 coloring