图是显微镜下观察到的小鱼尾鳍内的一部分血管的分枝情况箭头表示血流的方�请据图分析回答1图中a是 血管a.静脉b.动脉c.毛细2 Template




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tomski图是显微镜下观察到的小鱼尾鳍内的一部分血管的分枝情况箭头表示血流的方�请据图分析回答1图中a是 血管a.静脉b.动脉c.毛细2 coloring