某企业一新产品售给了千里之遥的一个体户。一日，电讯传来，产品出现故障，请求派人前往排除。该企业因事先有过承诺，接到电讯后，立即派工程技术人员乘飞机赶到现场，排除了故障，并无偿为这家用户培训操作技术，回来一算账，花费几千元，远远超过了这台产品的销售利润。于 A new product sold to a business thousands of miles away. One day, telecommunications came, the product fails, asked to send someone to exclude. The company had promised in advance, after receiving the telecommunications, immediately sent engineering and technical personnel rushed to the scene by plane, ruled out the fault and paid for the operation of this user training technology, come back to an account, cost a few thousand dollars, far more than The sales profit of this product. in