1)oil control ring gap,油环开口间隙2)piston ring gap clearance-oil control,油环开口间隙3)oil rim,油环4)oil ring,油环5)oil control ring,油环6)oil scraper ring,油环7)oil scraping ring,油环8)drip ring,油环9)scraper ring,油环10)oil ring,油环，甩油环
用法例句
35m tons is an anticline gas cap reservoir where con-densate gas accumulated in the structural high of the anticline and an oil rim with an area of 5.
