小明对所学知识进行归纳，其中有错误的一组是（ ）
A．常见的化肥：氯化铵、硝酸钾、过磷酸钙
B．常见干燥剂：石灰石、浓硫酸、生石灰
C．常见的合金：不锈钢、镁铝合金、生铁
D．常见营养物质：蛋白质、无机盐、维生素
A、氯化铵、硝酸钾、过磷酸钙分别是氮肥、复合肥、磷肥，故选项知识归纳正确．
B、常见干燥剂的有浓硫酸、生石灰，石灰石不具有吸水性，不能作干燥剂，故选项知识归纳有错误．
C、不锈钢、镁铝合金、生铁均属于合金，故选项知识归纳正确．
D、蛋白质、无机盐、维生素均属于六大营养素，故选项知识归纳正确．
故选B．
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