将一根枝条插入滴有红墨水的瓶中放在太阳下一段时间后将枝条纵切开用放大镜观察到被染成红色的结构是a筛管b导管c形成层d筛管和导管 Template




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tomski将一根枝条插入滴有红墨水的瓶中放在太阳下一段时间后将枝条纵切开用放大镜观察到被染成红色的结构是a筛管b导管c形成层d筛管和导管 coloring