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
单项选择题 The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.
单项选择题 The muster list shows each rig hand’s muster station，his duties during abandonment，basic instructions，and（）.
单项选择题 Small oil spills on deck can be kept from going overboard by（）.
