单项选择题
White smoke exhausting from a diesel engine can be caused by （）
A.low combustion temperature B.a leaking fuel nozzle check valve C.late fuel injection D.plugged oil-scraper ring hole
单项选择题 White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）
单项选择题 White smoke exhausting from a diesel engine can result from （）
单项选择题 White smoke exhausting from an operating diesel engine may indicate （）
