把芹菜的茎切断后插入红墨水中几小时后在显微镜下观察切口部位被染红的结构是 A.表皮层细胞b.韧皮部c.筛管d.导管——青夏教育精英家教�—— Template




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tomski把芹菜的茎切断后插入红墨水中几小时后在显微镜下观察切口部位被染红的结构是 a.表皮层细胞b.韧皮部c.筛管d.导管——青夏教育精英家教�—— coloring