单项选择题
Misfiring in a diesel engine at light loads can be caused by（）
A.high lube oil temperature B.low lube oil temperature C.excessive cylinder cooling D.high air injection pressure
单项选择题 In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）
单项选择题 When a diesel engine compression pressure is checked, the indicator is connected to the （）
单项选择题 Diesel engine mufflers accomplish noise reduction by （）
