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筛管由许多管状细胞上下连接而成如下图．每个管状细胞都是活的细胞但细胞核已经消失在上下相邻的筛管细胞的横壁上有很多小孔叫做筛孔．细胞质 Template






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tomski筛管由许多管状细胞上下连接而成如下图．每个管状细胞都是活的细胞但细胞核已经消失在上下相邻的筛管细胞的横壁上有很多小孔叫做筛孔．细胞质 coloring
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