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