单项选择题
Which of the following will be the function of lubricating oil used in marine engines?（）
A.to remove heat from oil cooled pistons B.to wash away wear detritus C.to neutralize acidic products D.all of the above
单项选择题 Which of the following may take place if the clearance of the main bearings are excessive?（）
单项选择题 Which of the following may lead to the engine NOT to start on air?（）
单项选择题 Which of the following may cause that an engine doesnt run on starting air?（）
