取一段带叶的枝条插在盛有稀释红墨水的瓶中放在阳光下过一段时间用刀片把枝条纵切开用放大镜观察被染成红色的是 A.导管b.筛管c Template




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tomski取一段带叶的枝条插在盛有稀释红墨水的瓶中放在阳光下过一段时间用刀片把枝条纵切开用放大镜观察被染成红色的是 a.导管b.筛管c coloring