单项选择题
A.to remove heat from oil cooled pistons B.to wash away wear detritus C.to neutralize acidic products D.all of the above
Which of the following may take place if the clearance ...
单项选择题Which of the following may take place if the clearance of the main bearings are excessive?（）
A.bearing knocks B.dropping of pressure of LO C.noises D.all the above
Which of the following may lead to the engine NOT to st...
单项选择题Which of the following may lead to the engine NOT to start on air?（）
A.starting air pressure too high B.correct timing of starting air valves C.three of the six starting valves stuck D.the turning gear disengaged
Which of the following may cause that an engine doesnt ...
单项选择题Which of the following may cause that an engine doesnt run on starting air?（）
A.too low starting air pressure B.main start valve closed C.neither A nor B D.A and B
