单项选择题
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
Before a tank is to be crude oil washed，the oxygen cont...
单项选择题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
Backfire flame arrestors are installed on（）.A.fuel tank...
单项选择题Backfire flame arrestors are installed on（）.
A.fuel tanks B.spark plugs C.carburetors D.distributors
Automatic fire dampers in ventilation systems are opera...
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
