单项选择题
A.under high pressure B.under low pressure C.heated to reduce viscosity D.cooled to increase viscosity
A.fuel oil pump will over-speed if dirt is not removed B.fuel oil transfer pumps cannot tolerate small amounts of dirt in the oil C.fuel injectors may be damaged by foreign particles in the fuel oil D.dirty fuel will clog the intake air filter
A.low lube oil temperature B.high ambient air temperature C.low tube oil pressure D.high exhaust system back pressure