单项选择题
A.Class "A" B.Class "B" C.Class "C" D.Class "D"
A fire may be spread by which of the following means?（）...
单项选择题A fire may be spread by which of the following means?（）
A.Conduction of heat to adjacent surfaces B.Direct radiation C.Convection D.All of the above
If emergency welding repairs must be made to the upper ...
单项选择题If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be （）
A.gas freed B.inerted C.filled with water D.all of the above as necessary
Which of the following statements is least likely to ca...
单项选择题Which of the following statements is least likely to cause the ignition of fuel vapors?（）
A.Static electricity B.An open running electric motor C.Loose wiring D.Explosion proof lights
