They are employed by roofing and general contractors, or they may be self-employed.
他们受雇于屋面和总承包商，或者有可能成为自雇人士。
This paper discusses the management model and operation process of general contract project item and analyzes the general contractors contract responsibilities and management system.
探讨了工程总承包项目的管理模式和运作过程，并在此基础上分析总结了总承包商的合同责任和管理体系。
This paper discusses the management model and operation process of general contract project item and analyzes the general contractors contract responsibilities and management system.
探讨了工程总承包项目的管理模式和运作过程，并在此基础上分析总结了总承包商的合同责任和管理体系。
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