But the current rural old - age security institution ( rosi ) is immethodical , and the formal institution is missing , so most peasants can only rely on family support and land protection 然而我国目前的农村养老保障制度不成体系,正式的养老制度缺失,大多数的农民仍然依靠家庭养老。
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The fourth is that the study on the enterprise product mix adjustment from the side of theory is scarce and fragmentary , immethodical . according to the existing problems , this thesis tries to take individual enterprise as the object of study and research the tactics and methods of enterprise product mix adjustment , and the models of enterprise product mix adjustment and whose effect factors , and trap enterprise may encounter in the course of enterprise product mix adjusting and tactics to elude them 针对上述存在的这些问题，本论文试图从微观层次上以单个企业为研究对象，对企业产品结构调整的具体策略及途径进行完整系统的探讨，并对企业产品结构的模型及其选择的影响因素，企业在进行产品结构调整过程中可能遇到的陷阱及规避的策略等实际问题进行深入的分析。
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