单项选择题
A.during the valve overlap period B.with only the exhaust valve open C.at a pressure below atmospheric D.without cooling the cylinders or pistons
A diesel engine piston crown can crack from （）A.excessi...
单项选择题A diesel engine piston crown can crack from （）
A.excessive piston to liner clearance B.excessive dirt beneath the piston crown that reduces heat transfer C.faulty nozzle spray D.all of the above
Fuel oil contamination of an auxiliary diesel engine lu...
单项选择题Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
A.an increased flash point B.higher lube oil pressures C.an increased viscosity D.lower lube oil pressures
When a fuel injection nozzle overheats, which of the pr...
单项选择题When a fuel injection nozzle overheats, which of the problems listed can be expected?（）
A.The fuel metering will vary B.The fuel will explode C.The cylinder head will crack D.The engine will stop
