肺泡和血液之间的气体交换后血液变成 血.血液中运输氧的细胞是 因为该细胞含有 物质.请用箭头按血流方�把“左心房左心室肺静脉主动脉 Template




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tomski肺泡和血液之间的气体交换后血液变成 血.血液中运输氧的细胞是 因为该细胞含有 coloring