图一为�吸系统的组成示意图.图二为肺泡与毛细血管之间的气体交换示意图请据图回答下列问题中b代表的物质是氧气血液从毛细血管的4流到 Template




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tomski图一为�吸系统的组成示意图.图二为肺泡与毛细血管之间的气体交换示意图请据图回答下列问题中b代表的物质是氧气血液从毛细血管的4流到 coloring