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Question
When refueling a vehicle carrying hazardous materials:
Answers
A.  The engine should be left on.
B.  The engine should be turned off.
C.  The gas nozzle may be left unattended.
Explanation
If you need to refuel a vehicle carrying hazardous materials, you must first turn off the engine. While refueling, someone must be at the nozzle and controlling the fuel flow at all times.
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