知識貝殼
知識貝殼
所屬欄目：水輪機與水泵專業(yè)英語
It is located at the exit of the nozzle preceding the runner buckets (Fig.2.2). Consequentupon a sudden rejection of load and a decrease in the demand of water, the needle quicklydecreases the area of flow. Otherwise the turbine would start racing. But if ......（本文共 1023 字 , 1 張圖） [閱讀本文] >>