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