单项选择题
A.the hose could burst
B.the nozzle end will whip about causing damage or injury
C.water damage to vessel's cargo or structure
D.personnel might trip over the hose
单项选择题 No outlet on a fire hydrant may point above the horizontal in order to（）.
单项选择题 Which statement is TRUE concerning spare charges for portable fire extinguishers on unmanned tank barges?（）.
单项选择题 A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.