如图表示将叶片制成切片在显微镜下观察到叶片的结构图.请据图回答1在图中植物体与外界环境进行气体交换的门户是b气孔它是由半月形的 Template




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tomski如图表示将叶片制成切片在显微镜下观察到叶片的结构图.请据图回答1在图中植物体与外界环境进行气体交换的门户是b气孔它是由半月形的 coloring