单项选择题
Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）
A.Reduce engine speed to idle before removing the filter B.Soak the dirty filter in kerosene only C.Blow out the air inlet with compressed air D.Cover the air inlet after removing the filter
单项选择题 Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?（）
单项选择题 When installing rings on a diesel engine piston, you should check the ring（）
单项选择题 If the piston ring gap remains insufficient when installing new rings, youshould（）
