叶子上表皮气孔为什么比下气孔少
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![叶子上表皮气孔为什么比下气孔少](/uploads/image/z/9674478-54-8.jpg?t=%E5%8F%B6%E5%AD%90%E4%B8%8A%E8%A1%A8%E7%9A%AE%E6%B0%94%E5%AD%94%E4%B8%BA%E4%BB%80%E4%B9%88%E6%AF%94%E4%B8%8B%E6%B0%94%E5%AD%94%E5%B0%91)
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