取一段带叶的植物枝条将下端插入滴有红墨水的水中过一段时间后枝条的一部分变红了变红的部位是 A.�皮b.形成层c.筛管d.导管 题目和 Template




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tomski取一段带叶的植物枝条将下端插入滴有红墨水的水中过一段时间后枝条的一部分变红了变红的部位是 a.�皮b.形成层c.筛管d.导管 题目和 coloring