在产品品种方面，史丹利聚焦专用肥的专业化生产，针对不同的需求层次，研制出包括史丹利三安，第四元素和劲素等专用性产品。史丹利三安是**首个总养分量达到54%的复合肥产品;第四元素主要针对**土壤中的中微量元素缺乏问题，补充中微量元素营养成分;劲素主要针对高端经济作物。与此同时，针对

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　　承诺一:接到报修电话，快速抵达维修现场。

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　　11、抓好陕西榆林工程工作面承包。孔令国负责。