带油道换位导线
Transposing cable with oil duct
内冷油道活塞
internally-cooled oil channel piston
铸件回油道缺陷
defects of casting oil Jacket
成品油管道建设
white oil pipeline construction
鲁皖成品油管道工程
Lu-Wan oil product pipeline project
石油管道检测
oil pipeline detecting system
石油管道协会
Association of Oil Pipe Lines
输油管道测量
petroleum pipeline survey
输油管道加压泵站
line booster pump station