1. Shanghai, China Shanghai early efficiency air filters, medium efficiency air filters, high efficiency filters, FFU Fan Filter Unit, Air Shower, ceiling keel.
地址上海市初效空气过滤器，中效空气过滤器，高效过滤器，FFU风机过滤单元，风淋室，天花龙骨。
2. The volume efficiency, mechanical efficiency and total efficiency of a two-screw multiphase pump were investigated in the case of pumping water-air mixture.
以水和空气为介质，在不同进口压力、不同增压比条件下，研究了多相泵的体积效率、机械效率和总效率等性能参数与含气率的相关性。
3. The influence of the change of centrifugal pump rotating speed on the efficiency of the whole pump-unit which due to the variation of the pump efficiency and pipeline efficiency is studied.
讨论了离心泵的运行转速改变后，由于泵效率和管路效率的变化而给整个果装置效率带来的影响，由此可以判断离心泵改变转速后，泵装置的运行是否合理，并可确定泵装置运行的最佳转速范围。
4. The volume efficiency, mechanical efficiency and total efficiency of a two-screw multiphase pump were investigated in the case of pumping water-air mixture.
以水和空气为介质，在不同进口压力、不同增压比条件下，研究了多相泵的体积效率、机械效率和总效率等性能参数与含气率的相关性。
5. By means of the data envelope analysis method, this paper appraises and analyzes 15 listed tourism companies' operation efficiency, pure technical efficiency and scale efficiency in 2005.
论文中利用数据包络分析方法对我国15家旅游业上市公司2005年的运营效率、纯技术效率以及规模效率进行了评价和分析。
