单项选择题
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
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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) -
单项选择题
When fighting a spreading fire resulting from a broken fuel line, you should FIRST （）.
A.look for a CO2 extinguisher
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The three basic elements necessary for any fire are （）.
A.heat, gas, and flames
B.fuel, heat, and oxygen
C.heat, nitrogen, and fuel
D.fuel oil, nitrogen, and oxygen
