单项选择题
A.foam or soda acid
B.dry chemical or foam
C.carbon dioxide or dry chemical
D.carbon dioxide or foam
单项选择题 The supply of carbon dioxide used in the fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for（）.
单项选择题 The success of an indirect attack on a fire depends on the（）.
单项选择题 The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.