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• “有收无收在于水，多收少收在于肥”这句农谚形象地说明了水对农作物生长发育的重要性，请完成围绕这句农谚提出的问题。(1)“有收无收”的“收”是指农业上的收成，即收获农作物上-七年级生物
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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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• 植物需要量最大的无机盐是[]A．氮、磷、钾B．钾、钙、镁C．铁、硼、钾D．钠、钾、铁-七年级生物
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