9.如图是人体内气体交换和运输示意图请据图回答1图中ab分别代表什么气体a二氧化碳 b氧气.2c和d的交换过程是通过气体扩散来 Template




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tomski9.如图是人体内气体交换和运输示意图请据图回答1图中ab分别代表什么气体a二氧化碳 b氧气.2c和d的交换过程是通过气体扩散来 coloring