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