o-ri - oile
- o-ring
- o/s
- OB
- obligatory\ debt
- obligatory\ stock
- OBM
- observation\ area
- observation\ on\ the\ work
- obtain\ bids
- obtain\ concurrence
- obtain\ impression
- obvious\ truism
- OC
- occupational\ disease
- occupational\ exposure\ limit
- occupational\ hazard
- occupational\ health
- occupational\ safety
- occupational\ safety\ and\ health\ administration
- occurrence
- ocean\ bottom\ cable
- ocean\ engineering\ group
- ocmposite\ anticline
- octane\ rating
- OD
- od\ cutting\ tool
- OEL
- OET
- off-design\ substance\ release
- off-shore\ facility
- off-shore\ oil\ shipment\ terminal
- off-site\ maintenance
- off-spec
- off-specs\ oil
- off-specs\ product
- off-spec\ crude
- off-spec\ crude\ storage
- off-spec\ off-specification
- off-take\ agreement
- off-the-job\ injury
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