气动平衡泵杆抽油机
air-balanced sucker-rod pumping unit
油气动平衡成藏
oil and gas dynamic balancing reservoir
发动机机油油槽区
engine oil sump compartment
发动机机油油路简图
engine oil flow schematic
发动机机油油位指示器灯
engine oil level indicator lamp
全自动动平衡机
automated balancing machine
automatic balancing machine