... wiper block 扶正块 wiper plug 刮塞 wiper trip 划眼起下钻；通井；刮拭起下钻 ...
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短语
衬管刮塞
liner wiper plug
填塞刮刀
filling knife
柔性填塞刮刀
flexible filling blade
刮油活塞环
oil scraper piston ring
;
wiper piston-ring
活塞刮油环
piston scraper ring
活塞刮削
piston scraping
活塞刮油环凸缘
flange of pol piston ring