单项选择题
A.stop ventilation to the area
B.stop the vessel
C.secure electricity to the circuit
D.apply CO2 to the fire
单项选择题 You are transferring fuel from the storage tanks to the day tanks by means of an electric fuel oil transfer pumpIf the pump motor catches fire, you would FIRST （）.
单项选择题 If the diesel fuel vapors present are within the flammable range （）.
单项选择题 Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.