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