单项选择题
Poor combustion in a diesel engine can be caused by （）.
A.high compression pressure B.low intake air temperature C.low exhaust pressure D.high scavenge air temperature
单项选择题 A built-up exhaust valve is one in which （）.
单项选择题 If scavenge box should be hot, （）would occur.
单项选择题 If exhaust temperatures are too high, you should check （）.
