單項選擇題The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.

A.secure all openings to the tank
B.discharge an initial charge of CO2 with a hand portable extinguisher
C.direct a fire hose into the tank and energize the fire main
D.spray the tank boundaries with a fire hose to promote cooling


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1.單項選擇題In fighting a fire in a fuel tank, the FIRST action you should attempt is to （）.

A.secure all sources of fresh air to the tank
B.begin transferring the fuel to other tanks
C.top off the tank to force out all vapors
D.station someone at the fixed CO2 release controls

2.單項選擇題Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）

A.The mixture is too lean to burn
B.The mixture is too rich to burn
C.The vapor is about to explode
D.Conditions are perfect for combustion

3.單項選擇題The volatility of a liquid is the tendency of a liquid to （）.

A.ignite
B.explode
C.asphyxiate
D.vaporize

4.單項選擇題An oxygen indicator will detect （）.

A.the amount of oxygen in a space
B.the presence of harmful amounts of carbon monoxide
C.concentrations of explosive gas
D.All of the above

5.單項選擇題When making entries in the Oil Record Book, all quantifies should be（）.

A.recorded as cubic meters with a conversion to barrels
B.verified by the Chief Engineer
C.recorded directly from the oil discharge monitor
D.consistently recorded through the Oil Record Book in one specified unit (gallons, barrels, cubic meters)