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单选题
The （） of the diesel oil must not exceed 120 degree Fahrenheit.
A
temperature
B
pressure
C
acid value
D
viscosity
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sludgeB
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high alkaline reserveC
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单选题The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.A
invadeB
provideC
detergentD
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单选题When running a large, low-speed, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching back over to diesel oil?（）A
The diesel oil must never be allowed to mix with the heavy fuelB
The temperature of the fuel from the pre–heater should be gradually reduced after switching over the three–way valveC
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