发票或收据是消费者购物的重要书证。消费者购买的商品一旦出现质量问题 ,不论是“三包”、投诉、还是到法院起诉 ,其重要凭证就是发票或收据。目前农机产品经营部门较多 ,其中有的部门不具备经营权利 ,不能为农民提供正式票据 ,有的经营者为逃税而不给农民开具票据 ,更有甚者 Invoice or receipt is an important consumer card book. Once the quality of the goods purchased by consumers appears, whether it is “Three Guarantees”, complaints, or to the court for prosecution, the important document is the invoice or receipt. At present, there are many agricultural machinery product management departments, some of which do not have the right to operate, can not provide farmers with an official bill, and some do not issue bills to farmers for tax evasion