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
单项选择题 Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
单项选择题 When a fuel injection nozzle overheats, which of the problems listed can be expected?（）
单项选择题 Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）
