19.将一根带叶的枝条插入装有红墨水的瓶中放在阳光下一段时间后把枝条纵切用放大镜观察被染成红色的结构是 A.韧皮部中的筛管b.木质 Template




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tomski19.将一根带叶的枝条插入装有红墨水的瓶中放在阳光下一段时间后把枝条纵切用放大镜观察被染成红色的结构是 a.韧皮部中的筛管b.木质 coloring