单项选择题
Which portable fire extinguisher should be used on a class C fire on board a vessel?（）
A.Carbon dioxide B.Water (stored pressure) C.Foam D.Carbon tetrachloride
单项选择题 Which portable fire extinguisher is normally recharged in a shore facility?（）
单项选择题 Which item is NOT included in the fireman’s outfit on a cargo vessel?（）
单项选择题 Which is a disadvantage of Halon as a fire extinguishing medium?（）
