19.人体的血液循环结构有下图现象分析回答问题1如果血液流动方�是a→x→b则x为心脏的左侧2如果x表示肺则血液的流动方�是c Template




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tomski19.人体的血液循环结构有下图现象分析回答问题1如果血液流动方�是a→x→b则x为心脏的左侧2如果x表示肺则血液的流动方�是c coloring