取一段带有叶片的木本植物枝条插入装有稀释红墨水的瓶子里过一段时间将该枝条纵切看到被染成红色的部分是 A.韧皮部b.导管c.筛管d Template




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tomski取一段带有叶片的木本植物枝条插入装有稀释红墨水的瓶子里过一段时间将该枝条纵切看到被染成红色的部分是 a.韧皮部b.导管c.筛管d coloring