單項選擇題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


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1.單項選擇題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

2.單項選擇題A burning AC motor would be considered what class of fire?（）

A.Class "A"
B.Class "B"
C.Class "C"
D.Class "D"

3.單項選擇題Fire dampers prevent the fire spreading through the process of （）.

A.convection
B.conduction
C.radiation
D.direct contact

4.單項選擇題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