液压扩张的井壁刮刀
hydraulic expansion wall scraper
水力撑开的井壁刮刀
rotary hydraulic expansion wall scraper
并联内插管双室扩张式
Parallel expansionary insert-pipe inside of two-room equivalent circuitry
单腔扩张式消声器
Single cavity expansion silencer
可调扩张式铰刀
adjustable expanding reamer