心房和心室之间有房室瓣只能朝�心室开心室和动脉之间有动脉瓣只能朝�动脉开保证血液按一定的方�流由心房流�心室再流�动脉——青夏教育 Template




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tomski心房和心室之间有房室瓣只能朝�心室开心室和动脉之间有动脉瓣只能朝�动脉开保证血液按一定的方�流由心房流�心室再流�动脉——青夏教育 coloring