某企业工会代表全体职工与企业签订了集体合同。集体合同规定;职工工作时间为每日8小时,每周40小时,职工工资每月不低于750元。该合同经劳动行政部门审查备案,无异议。合同生效后,该企业招聘苏诚海为技术工人,未签订劳动合同,口头约定:工作时间为每日10小时,每周50小时,工资每月1500元。两个月后,苏诚海向企业负责人提出 A trade union on behalf of all employees and enterprises signed a collective contract. Collective contract provisions; workers working hours for 8 hours a day, 40 hours a week, monthly salary of workers not less than 750 yuan. The contract by the labor administrative department for the record, no objection. After the contract came into effect, the company recruited Su Chenghai as a technical worker and did not sign a labor contract. The agreement was oral: the working hours were 10 hours a day, 50 hours a week, and the monthly salary was 1,500 yuan. Two months later, Su Chenghai put forward to the person in charge of the enterprise