在观察植物叶片的结构时需要区分上表皮和下表皮下列方法正确的是 A把形态扁平的一层细胞定为上表皮b把无色透明的一层细胞定为上表皮c Template




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tomski在观察植物叶片的结构时需要区分上表皮和下表皮下列方法正确的是 a把形态扁平的一层细胞定为上表皮b把无色透明的一层细胞定为上表皮c coloring