外出打工的朋友经常因为合同不规范而出现打不清的官司，吃了哑巴亏，专家提醒您，下列６种合同不能签。１．口头合同这类合同一般是由熟人牵线介绍签订的，没有书面合同，一旦发生利益纠纷因无字据为证，打工者利益必然受损。２．简单合同这类合同虽有字据，但内容过简，含义 Migrant workers often because of the contract does not regulate the emergence of unclear lawsuit, eat dumb Pakistan, experts remind you that the following six kinds of contracts can not sign. 1. Oral contracts such contracts are generally introduced by an acquaintance, without a written contract, in the event of a conflict of interest because there is no evidence, the interests of migrant workers inevitably suffer. 2. Although there is a simple contract contract evidence, but the content is simple, meaning