Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.<br>A:insulate your shoes<br>B:ground the fire hose<br>C:secure its power supply<br>D:start the fire pump

Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.
A:insulate your shoes
B:ground the fire hose
C:secure its power supply
D:start the fire pump

出自：海船船员证

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