单项选择题
Low compression pressure in a diesel engine is caused by（）
A.low water in the expansion tank B.improperly seated valves C.low fuel oil pressure D.worn or broken cylinder liner sealing rings
单项选择题 A pyrometer is an instrument used to measure the temperature of the diesel engine（）
单项选择题 Low compression pressure in a diesel engine can be caused by（）
单项选择题 During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）
