Traditional contacting level measurement systems , such as the hydrostatic and capacitive systems , are simple and cheap , but the measurement is affected by the physical properties of the media in the tank and thus it is difficult to achieve high accuracy 高精度液位测量对各种液位自动控制系统的正常运行，对保证各种液体货物的安全储运以及对保证各种液体货物贸易的公平合理进行、避免国家财产的流失均有重要意义。
By calculating instability factor in research area , this paper gives some corresponding suggestion . this paper shows engineering instability around instrument foundation and coupling relation to the circumjacent seabed , and research the dynamic response between wave and seabed , and enriches the research content of instability of seabed around instrument foundation and give some appropriate suggestion to foundation planning of ocean engineering , also it prevents instrument , facility and property of state from losing and risking 这篇论文揭示了构筑物地基土的工程稳定性及与周边海域互动祸合关系，研究了浅水区构筑物底床在波浪等水动力作用下的动力响应，丰富了构筑物周边水下底坡稳定性研究的内容，为海上工程设施的地基设计提供了良好的理论指导性建议，对保障海上安全生产、保证海洋设施的完整及使国家财产免受损失也有重要的现实意义。
With the development of city construction , the population is increasing rapidly , skyscrapers and underground buildings are everywhere , flammable materials are used more widely , fires are more likely to happen , thus fire - fighting is very important to national asset and people lives 随着城市建设的发展，人口密度增大，高层、地下建筑增多，易燃易爆材料增多，城市发生火灾的概率就越来越高，所以消防直接关系到国家财产和人民生命安全，一旦意外发生火灾，得不到即时营救，将会造成无法估量的损失。
Answer : system of admittance of so - called obtain employment is to point to a basis " labor law " and " the profession teachs a law " concerned regulation , complex to pursueing a technology , versatility the wide , profession that involves safety of life of national riches , people and consumer interest ( type of work ) laborer , must pass groom , after obtaining professional qualification letter , square but the system of obtain employment mount guard 答：所谓就业准入制度是指根据《劳动法》和“职业教育法”的有关规定，对从事技术复杂、通用性广、涉及到国家财产、人民生命安全和消费者利益的职业（工种）的劳动者，必须经过培训，并取得职业资格证书后，方可就业上岗的制度。
Undoubtedly , deterioration and damage accumulation occur in high temperature and high pressure . with the consumption of their use , the failure accidents occur more frequently , which will bring threatening to the life of people and the poverties of enterprise . so the failure analysis and the residual life assessment of the main steam pipe become more and more urgent and important 以蠕变性能作为设计指标的主蒸汽管道是发电厂的关键部件，由于长期在高温高压的恶劣工况下运行，容易发生材质老化和损伤积累，突发性事故也会频频发生，给企业职工的生命安全和国家财产带来严重威胁，因此对主蒸汽管道进行失效分析与寿命预测尤为迫切和重要。
