如图是人体肺部与血液进行气体交换示意图根据图回答1如图所示的结构3外面包绕丰富的毛细血管仅由一层上皮细胞构成是肺部进行气体交换的 Template




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tomski如图是人体肺部与血液进行气体交换示意图根据图回答1如图所示的结构3外面包绕丰富的毛细血管仅由一层上皮细胞构成是肺部进行气体交换的 coloring