如图为动脉血管和静脉血管的横切面示意图请你据图回答下列问题1a所代表的血管是 血管判断的依据是 .2在 血管内的血液流动速度较快 Template




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tomski如图为动脉血管和静脉血管的横切面示意图请你据图回答下列问题1a所代表的血管是 血管判断的依据是 .2在 coloring