4.如图为叶片横切面结构图请据图回答问题1气体交换和水分散失的门户是�气孔它由成对的保卫细胞围成.2将叶片制造的有机物输送到其他 Template




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tomski4.如图为叶片横切面结构图请据图回答问题1气体交换和水分散失的门户是�气孔它由成对的保卫细胞围成.2将叶片制造的有机物输送到其他 coloring