Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.

Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.

Fighting a rig fire in a watertight compartment with hoses could reduce the stability of the rig by（）.

Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.

Fire dampers prevent the spread of fire by（）.

During the day，a dredge will indicate the side on which it is safe to pass by displaying（）.

Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the（）.

Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.

Fire protection regulations for towing vessels allow all of these types of fuel piping，EXCEPT（）.

Each OSV must carry（）.