单项选择题
Fire dampers prevent the spread of fire by（）.
A.convection B.conduction C.radiation D.direct contact
单项选择题 Fighting a rig fire in the ballast pumproom with hoses would adversely affect the stability of the rig most by（）.
单项选择题 Fighting a rig fire in a watertight compartment with hoses could reduce the stability of the rig by（）.
单项选择题 Each OSV must carry（）.
