20.如图为心脏结构图据图回答1a左心房 b左心室 C右心房 D右心室.abcd连接的血管分别是肺静脉主动脉上下腔静脉 Template




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tomski20.如图为心脏结构图据图回答1a左心房 b左心室 c右心房 coloring