右图为�吸系统有关结构示意图分析回答�吸系统中气体交换的场是 2外界空气到达图中3后气体交换在 内进行此处适于 Template




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tomski右图为�吸系统有关结构示意图分析回答�吸系统中气体交换的场是 2外界空气到达图中3后气体交换在 内进行此处适于 coloring