在大规模的分布式数据库系统中，数据库复制对于系统的可靠性及效率起着非常关键的作用。
In the extensive distributed data base system, the data base duplication plays a very key role to the dependability and efficiency of the system.
农田水利基础设施的供应及使用效率制约着农田灌溉规模的增长，影响着粮食供给的安全性。
The supply and the using efficiency of the IWC restrict the growth of field irrigative scale and affects the security of food provision.
JRT型热过载保护器临界电流检测仪采用多受检器件串联及电子变换检测线路，提高了保护器大规模生产的效率和检测的准确度。
A number of detected electric elements are series and an electronic detective circuits are adopted in the critical current detector for JRT thermal overload protector.
得出的结论主要有：历年来河北、辽宁、上海及贵州等地区均表现出了较高的技术效率，同时绝大部分地区船舶生产处于规模报酬递增的阶段；
The main results can be summarized as follows:there are a higher technical efficiency in Hebei, Liaoning, Shanghai and Guizhou district during the sample period.
医疗仪器设备及器械行业、制药专用设备和中成药行业同时具有技术效率和规模效率；
Medical equipments and instruments, pharmaceutical equipments and Chinese patent medicine have both technical and scale efficiencies.
医疗仪器设备及器械行业、制药专用设备和中成药行业同时具有技术效率和规模效率；
Medical equipments and instruments, pharmaceutical equipments and Chinese patent medicine have both technical and scale efficiencies.
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