如图是显微镜下观察到的小鱼尾鳍内的一部分血管的分支情况箭头表示血流的方�请据图回答1图中a是 血管.2只允许红细胞单行通过的血管 Template




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tomski如图是显微镜下观察到的小鱼尾鳍内的一部分血管的分支情况箭头表示血流的方�请据图回答1图中a是 血管.2只允许红细胞单行通过的血管 coloring