单项选择题
A.secure the fuel manifold
B.shut off power to the pump
C.shut off the power ventilation
D.spray water on the fire
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 （）.
单项选择题 While working in the engine room, you hear seven short blasts followed by one long blast on the ships whistle, supplemented by the same signal on the general alarm bellsYou should （）.