据图回答下列问题 上图是肺泡内的气体交换示意图箭头a是指静脉血流动的方�箭头d是指动脉血流动的方�b指二氧化碳气体扩散的方�c指氧气 Template




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tomski据图回答下列问题 上图是肺泡内的气体交换示意图箭头a是指静脉血流动的方�箭头d是指动脉血流动的方�b指二氧化碳气体扩散的方�c指氧气 coloring