The paper introduces the necessity the purpose and some study methods separately . it also introduces the actuality of the ship refrigerated carrying , types of the refrigeration systems of the ship the stand - alone and more storerooms system in the high and low temperature refrigeratory system of the ship , some advantages of the new cycle , the principle of the erector , the parameter design theory and construction size of the ejector in the new refrigeration cycle , the test study in the high and low temperature refrigeratory system of the ship which includes the test device , the operation console , the principle chart of the refrigeration system , the computer testing results and so on 本文分别叙述了本课题研究的必要性、意义及内容；船舶冷库制冷系统的型式、船舶高、低温冷库的单机多库系统，并重在理论上分析了新循环较原循环有许多优越性；制冷新循环中的喷射器的原理、参数设计理论及结构尺寸；船舶高、低温制冷系统的实验研究，包括实验装置、实验操作控制台、制冷系统原理图、微机检测情况及实验结果：研究结论与实用价值等。
It is not only influnce the survival of valin group but also influnce the industrialization progress of hunan province . this book appraised the foreground of the product market , raising money and using money , budget and potential risk of this project by using the method of project evaluation , analysised avail factor and disadvantage factor , then bring forward measures of evading project risk to help erector and bank who provide a loan 本文运用项目评估方法，对华菱薄板项目的产品市场前景、资金筹措与运用、财务预测与分析及项目潜在风险等方面进行评价，分析项目建设的有利因素和不利影响，得出评估结论，提出规避项目风险的措施，为项目建设单位及项目资金承贷银行提供指导和帮助。
Construction project post evaluation is to analyze the whole project including analyzing project aim , enforcing procedure , project profit , project function , project influence , and sum up positive and negative experience and lesson , so that it can make decision - maker , administrant , erector improve the level of decision - making , management and construction . the paper introduces its status quo , questions ， developing necessity and development countermeasure currently 建设项目后评价是在项目投资完成以后，对项目目的、执行过程、效益、作用和影响所进行全面系统地分析，总结正反两方面的经验教训，使项目的决策者、管理者和建设者学习到更加科学合理的方法和策略，提高决策、管理和建设水平。
