phymath999
Sunday, February 1, 2015
血液由心脏的心室流向动脉,流向由动脉分支形成毛细血管,在毛细血管处进行物质交换,再流向静脉,流回心脏的心房
血液由心脏的心室流向动脉,流向由动脉分支形成毛细血管,在毛细血管处进行物质交换,再流向静脉,流回心脏的心房
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