叶片的结构:叶的 表皮气孔�, 表皮气孔多。上表皮细胞排列紧密,故颜色深,下表皮细胞排列疏松,故颜色浅。 是水分散失的“门户”也是气体交换的 Template




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tomski叶片的结构:叶的 表皮气孔�, 表皮气孔多。上表皮细胞排列紧密,故颜色深,下表皮细胞排列疏松,故颜色浅。 coloring