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• 比较正常叶片和缺少氮磷钾的叶片，用线段将对应关系连接起来。A．正常叶片a．叶片发黄、植株矮小B．缺少氮肥的叶片b．浓郁、植株健壮C．缺少磷肥的叶片c．叶片边缘发黄D．缺少钾肥的-七年级生物
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• 植物生长中需要量最多的无机盐是[]A．含氮的、含磷的、含钾的无机盐B．含氮的、含磷的、含铁的无机盐C．含硼的、含磷的、含钾的无机盐D．含氮的、含磷的、含锌的无机盐-七年级生物
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• 苹果树的“小叶病”和油菜的“华而不实”，其原因可能是分别缺少[]A．氯和铁B．磷和硼C．锌和硼D．磷和镁-八年级生物
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