如图是叶片结构示意图据图回答问题1图中的�和�分别表示上表皮上表皮和下表皮下表皮.它 们各由一一层细胞构成在其细胞的外壁常有一层角质 Template




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tomski如图是叶片结构示意图据图回答问题1图中的�和�分别表示上表皮上表皮和下表皮下表皮.它 们各由一一层细胞构成在其细胞的外壁常有一层角质 coloring