3.下列关于筛管的描述正确的一组是 �运输有机物的通道 �运输水分和无机盐的通道�由死细胞构成 �由活细胞构成�管道内有筛板 �管道中空 Template




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tomski3.下列关于筛管的描述正确的一组是 �运输有机物的通道 �运输水分和无机盐的通道�由死细胞构成 coloring