抽油机节能
pumping energy
the energy saving of oil pump
游梁式节能抽油机
beam-pumping energy saving unit
摩擦式智能抽油机
friction-type pumping unit
双井抽油机机架
the frame of double-well pumping unit
直线电机抽油机
linear motor pumping unit
柴油机机油冷却器
diesel oil cooler
lube oil cooler for diesel engine
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