Meanwhile , in the experimental work , the scope of the equation that reveals the relation between the magnet force and the working distance is defined definitely . different materials of the magnet core are compared in terms of their influence to the valve . however , it is only initiatory , more work needs to be done in the future 同时，还采用试验研究的手段深入分析了电磁阀工作间隙与电磁吸力之间的关系，明确了吸力公式的应用范围，同时，在不同材料的对比试验中，分析了磁性能较好的铁氧体和铁铬合金以及工业纯铁对电磁阀工作性能的影响，对合理确定电磁阀铁芯的制作材料进行了初步的探讨。
Using the method of the minimum square summation , counting larger index of pipe length , distribute initiatory flow of pipe networks . it can better considerate the pipe lenth ' s influence to flow , and it ' s results are fitter for the theories of flow distribution . it is the best one in all optimal methods and propitious to finish the calculation by computer 这种计高幂次管长的最小平方和法分配管网初始流量，既不要预先确定管段水流方向又特别加重考虑了管长的因素，是现有的流量分配方法中最可取的一种，还便于用计算机一并完成全部计算。
There were four stages in the establishment , development and evolvement of the history compiling institution of qing dynasty , namely the initiatory stage , from the year of tianming to the early kangxi era ; the developing stage , from the early kangxi era to the late period of yongzheng ; the flourishing stage , between qianlong and jiaqing ; the recessionary stage , from daoguang to xuantong 摘要清代修史机构的设置及发展演变分为四个阶段，即天命到康熙初年的起始阶段、康熙初年到雍正末年的发展阶段、乾隆、嘉庆年间的完善阶段、道光至宣统时期的衰落阶段。
