所屬欄目:水輪機(jī)與水泵專業(yè)英語
There are many variations in the design of the screw type positive displacement, rotarypump. The primary differences consist of the number of intermeshing screws involved, thepitch of the screws, and the general direction of fluid flow. Two common designs ......(本文共 2849 字 , 2 張圖) [閱讀本文] >>