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
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A burning AC motor would be considered what class of fire?（）
A.Class "A"
B.Class "B"
C.Class "C"
D.Class "D" -
单项选择题
Fire dampers prevent the fire spreading through the process of （）.
A.convection
B.conduction
C.radiation
D.direct contact -
单项选择题
A fire, occurring in the windings, of an overloaded electrical motor, is considered a （）.
A.class "A" fire
B.class "B" fire
C.class "C" fire
D.class "D" fire
