单项选择题
Before using a fixed CO2 system to fight an engine room fire，you must（）.
A.secure the engine room ventilation
B.secure the machinery in the engine room
C.evacuate all engine room personnel
D.All of the above
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Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.
A.immediately above the level of the oil
B.at the top of the tank
C.in the vent riser
D.one meter from the deck -
单项选择题
Backfire flame arrestors are installed on（）.
A.fuel tanks
B.spark plugs
C.carburetors
D.distributors -
单项选择题
Automatic fire dampers in ventilation systems are operated by use of（）.
A.remotely operated valves
B.fusible links
C.C02 system pressure switches
D.heat or smoke detectors
