单项选择题
Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）
A.water in the fuel B.insufficient fuel for combustion C.clogged air intake passages D.burning lubricating oil
单项选择题 Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）
单项选择题 An emergency diesel generator should automatically shut down in the event of （）
单项选择题 The purpose of the flywheel is to （）
