high efficiency ball-screw 高效率的滚珠丝杠
High efficiency semi hermetic screw 高能效半封闭螺杆式
screw conveying efficiency 螺旋输送效率
high-efficiency screw pump 高效螺杆泵
efficiency of screw 螺旋副效率
ideal efficiency screw propeller 螺旋桨理想效率
Field application demonstrates that the management level and economic efficiency of the screw pump production system would be improved by using the control chart.
现场应用表明，根据螺杆泵油井工况宏观控制图，可提高螺杆泵采油系统管理水平及经济效益。
The regularity can be applied to optimize the design of screw pumps and improve its working efficiency.
利用此规律可对螺杆泵进行优化设计，提高其工作效率。
Usually, the fullest efficiency of screw propeller is 75% with the rest energy lost in the way of whirlpool.
通常螺旋推进器最大效率为75％，其余的能量以漩涡的形式损失。
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