如图是血液循环示意图图中各字母代表血管.请据图回答1a血管与左心室连通处有动脉瓣其作用是 .2b血管入肝其血管血液中的氨基酸和 Template




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tomski如图是血液循环示意图图中各字母代表血管.请据图回答1a血管与左心室连通处有动脉瓣其作用是 .2b血管入肝其血管血液中的氨基酸和 coloring