如图是叶片横切面图据图回答问题.1具有保护作用的结构是上表皮上表皮和下表皮下表皮有输导功能的结构是叶脉叶脉叶片与外界进行气体交换的 Template




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tomski如图是叶片横切面图据图回答问题.1具有保护作用的结构是上表皮上表皮和下表皮下表皮有输导功能的结构是叶脉叶脉叶片与外界进行气体交换的 coloring