单项选择题
A.the sump oil level
B.oil flow sight glasses
C.bearing temperatures
D.all of the above
单项选择题 Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）
单项选择题 The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）
单项选择题 Which of the following statements concerning the lubrication of diesel propulsion engines used in vessels over 300 gross tons is most accurate?（）