Operation era经营时代operationn.操作；运转；经营；行动；手术；运算；生效；（复）运筹学operation supervision业务监督operation cost method作业成本法operation of business经营企业operation regulations操作规程operation irregularity工作事故operation at part load部分负荷运行Operation Orientations办学定位operation power charge运行电费operation of hip joint髋关节手术operation of liability负债融资