17.如图是叶片在结构示意图下列说法不正确的是 A.�和�是表皮有保护作用b.�是叶脉有输导作用c.�是气孔是气体交换的“窗口 D Template




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tomski17.如图是叶片在结构示意图下列说法不正确的是 a.�和�是表皮有保护作用b.�是叶脉有输导作用c.�是气孔是气体交换的“窗口 d coloring