单项选择题
The lowest temperature at which fuel combustion becomes self-sustaining in the presence of a source of ignition, is defined as the （）
A.auto-ignition point
B.flash point
C.burning temperature
D.fire point
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Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）
A.double bottom fuel oil tank temperature
B.heater supply steam flow
C.pressure of the fuel supplied to the burners
D.attemperator steam flow in the heater discharge circuit -
单项选择题
The construction of the main propulsion engine lube oil sump should （）
A.have no plating joints of 90
B.retain the lube oil as long as possible before it recirculates through the system
C.provided drain/return lines that are no greater than 24 inches from the pump suction
D.be provided with only a perfectly horizontal bottom -
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Main engine room control console alarms are to be of the self monitoring type, meaning that an open circuit to a particular alarm circuit will （）
A.cause an alarm condition
B.secure power to the indicator
C.secure power to the monitored device
D.automatically recluse within 10 seconds
