单项选择题
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 （）
单项选择题 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 （）
单项选择题 At which of the following locations would a duplex pressure gage most likely be located?（）