一、案情简介2005年的7月,浙江某县级市的外贸公司与乌干达客商签订出口发动机若干台的合同,贸易术语是CIF Entebbe(恩德培),货值23,000美金,运输方式为空运,付款方式为发货前支付货款。按合同的约定,我方外贸公司如期备好货并出具了相应的质量证明书,客商以快件形式邮寄了一张 I. Introduction to the case In July 2005, a foreign trade company in a county-level city of Zhejiang signed a contract with a Ugandan merchant to export several engines of the engine. The trade term is CIF Entebbe, with a value of US $ 23,000. The mode of transport is air transportation and payment is made Way to pay for the goods before delivery. According to the contract, our foreign trade company prepares the goods as scheduled and issues the corresponding quality certificates. The merchants mail one by express mail