心脏是血液循环的动力来源血管是血液流动的管道.血液循环可为人体细胞运来氧气和营养物质运走代谢废物.认识心脏的结构和血管类型懂得止血常识和 Template




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tomski心脏是血液循环的动力来源血管是血液流动的管道.血液循环可为人体细胞运来氧气和营养物质运走代谢废物.认识心脏的结构和血管类型懂得止血常识和 coloring