上限制

• Present the experimental research carried out on strain and stress by applying the resistance strain surveying technique to the big hole sealed heads in the new fire - tube heating boilers with the laws of strain and stress distribution obtained and allowable working pressure given because there is no applicable standards or specification for calculating the strength of crude oil heating boiler heads perforated by densely distributed big - holes , which , to a certain extent , hampered the further development of crude oil heating boilers in china , and concludes from experimental results that strain and the stress of circumference are fairly large near the edge of big - hole , and the cross ribs enhance strength of sealed head to a certain degree
  油田火筒加热炉密集大开孔封头的设计计算，因没有相应的强度计算标准在一定程度上限制了我国油田火筒加热炉技术的发展.采用电阻应变测量技术，对新型火筒加热炉大开孔封头进行了应力应变试验研究，得到了封头的应变和应力分布规律，给出了大开孔封头允许的工作压力.试验结果表明，大孔边缘圆周处应力应变较大，十字筋板对封头有一定加强作用
• Computer units including pc and single chip connected through serial interface were applied widely in industry control , condition measure . these systems almost communicate through rs232 , rs485 or modem . these manners limit deeply situation of the units " application though these economy and practicality
  单片机和pc机通过串行接口构成的多微机系统已经广泛应用于工业控制、环境监测等场合，这些系统大多采用rs232 、 rs485或是有线modem的通信方式，虽然很经济实用，但是有线数据传输方式很大程度上限制了其使用的场合。
• In research on history of higher education , because understanding fuzzy and processing not as well as the two related to the historical truth and the historical value relations itself inherent contradictory and sleepy limits the higher history of education research in the certain degree to be thorough and the development
  摘要高等教育史研究中，由于对历史真理与历史价值的关系认识模糊和处理不当，以及二者关系本身固有的矛盾和困难，在一定程度上限制了高等教育史研究的深入与拓展。
• Although m & a in our country has gained comparatively full development , the phenomenon of target firm being priced vaguely and lacking scientific basis is not minority in the practice of m & a . the analysis of implied returns and costs is always easy to be neglected by the acquisition enterprises , which limits the efficient appliance of m & a to an extreme degree and thus affects the efficiency of the whole economic run
  虽然我国的企业购并已经取得了较为充分的发展，但是企业购并实践中目标企业定价模糊、缺乏科学依据的现象并非少数，购并企业往往容易忽视目标企业中隐含收益及隐含成本的分析，从而在很大程度上限制了企业购并的有效运用，进而影响到整体经济运行的效率。
• Many college and institution always concentrate on the research work of this aspect , and obtain some results . but the concrete geology term of the business enterprise of mining complicacy variety , some keys of the technique problem did not get the good solution , this limit system application of technique cad from a certain degree . it is necessary that we deep into the research the cad technique with the geological and geodesic graph , commencing from the foundation of the mining , and promote the cad technique the application and developing to design in the mining enterprise
  然而由于矿山企业矿床成因不同，地质条件复杂多变， cad技术在矿山生产设计中的应用，虽然有许多学校和科研单位一直致力于这方面的研究工作，取得了一些成果，但还是有一些关键的技术问题没有得到很好的解决，从一定程度上限制了cad技术的应用，有必要从矿山的基础工作入手，深入研究地测cad技术，促进cad技术在矿山生产设计中的应用和发展。
• Because of the complexity of the distributed system and laking of methodology , guildline of software engineer and corresponding tools support on applying dct to develop great software compared with traditional method , all of these limits the application of dct . it is seldom found that dct are used in medical domine exspecially telemedicine domian
  由于分布式系统开发本身的复杂性，并且相对于传统方法，在大型软件开发过程中应用分布式对象技术还缺乏必要的方法论、软件工程的指导原则以及相应的工具支持，这在一定程度上限制了分布对象技术的应用。
• But it also includes two fatal disadvantages : first , at is difficult to be sintered and its density is low , which causes its lower strength ; second , in the temperature range of 1023 - 15 73 k , at can decompose into al2o3 and tio2 easily , which can cause the stress concentrated and raise the heat expansion rate
  但是该材料本身存在的两大致命的缺点，在很大程度上限制了它的广泛应用： ( 1 ) 、钛酸铝难以烧结，烧结体的致密度低，因而强度不高； ( 2 ) 、在750 1300的温度范围内易分解成氧化铝和二氧化钛，造成材料内部应力集中，并使材料的热膨胀率升高。