Study on Clock Synchronous System for 220 kV Substation's Multiple Automation System in Shengli Oil Field Power System 胜利油田电网220kV综自变电站时钟同步系统研究
It is indicated that the precise flat Plate, hollow column and clock gauge should be selected properly to satisfy actual requirements for measuring accuracy of oil well pump liners. 指出在实际生产中应根据需要选择合适精度的精密平板、空心立柱和千分表来装配,以满足抽油泵衬套测量精度要求。