导管与管胞均是木质部中执行运输功能的细胞它们的主要差别在于哪一项 A是否是死细胞 B 次生壁加厚方式 C穿孔板的有无 D细胞的长宽比 Template




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tomski导管与管胞均是木质部中执行运输功能的细胞它们的主要差别在于哪一项 a是否是死细胞 b coloring