项目销售额，毛利，成本分析；找出问题。
工作描述：1。负责公司产品及原材料成本核算，进销存系统数据的跟进和维护，销售统计和成本分析。
Job description: 1. Responsible for the company's products and raw material cost accounting, Invoicing system of follow-up and maintenance of data, sales statistics and cost analysis.
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