You must check the oxygen and gas content before working ................
You have to inform the bridge before working ................
Excessive noise can cause .............
Instant cold pack can be helpful in ............... .
You must use a lifeboat or a liferaft when you need to ................ in emergencies.
You have to go to the ................. immediately when there is an emergency.
Distress signals are sent when there is a/an ................ on board.
Welding-shields protect your eyes from ............ during welding.
Falling from the heights can be prevented by wearing ..................
Snap-back zone is the dangerous area during ............... operations.