人们在进行经济贸易活动时，为使贸易顺利合法进行和维护双方的利益，常需签订同。签订的书面合同主要有两种形式，一种是条款较完备，内容较全面的正式合同，如出口合同或销售合同以及进合同，另一种是内容简单的简式合同，如销售确认书和购买确认书。签订出口或进口合同要求 When conducting economic and trade activities, people often need to sign the agreement for the smooth and legitimate trade and for safeguarding the interests of both sides. There are two main forms of written contract signed, one is a more complete and comprehensive formal contract, such as export contract or sales contract and contract, and the other is simple contract, such as sales confirmation and Purchase confirmation. Signed export or import contract requirements