单项选择题
A.straw B.booms C.skimmers D.chemical dispersants
The preferred agent used in fighting a helicopter crash...
单项选择题The preferred agent used in fighting a helicopter crash fire is（）.
A.CO2 B.dry chemical C.water D.foam
The outlet at a fire hydrant may be positioned anywhere...
单项选择题The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.
A.45°upward B.vertically upward C.vertically downward D.all of the above
The muster list shows each rig hand’s muster station，hi...
单项选择题The muster list shows each rig hand’s muster station，his duties during abandonment，basic instructions，and（）.
A.all emergency signals B.instructions for lowering the survival craft C.the time each weekly drill will be held D.work schedule
