请据图回答下列问题1图二所示的肺泡壁和毛细血管都是有一层扁平的上皮细胞上皮细胞构成这有利于气体交换气体交换2图二中a代表的物质是 Template




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tomski请据图回答下列问题1图二所示的肺泡壁和毛细血管都是有一层扁平的上皮细胞上皮细胞构成这有利于气体交换气体交换2图二中a代表的物质是 coloring