单项选择题
A.dangerous over-speeding
B.a loss of lube oil pressure
C.activation of the fixed CO2 system for the emergency generator space
D.all of the above
单项选择题 The purpose of the flywheel is to （）
单项选择题 While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）
单项选择题 Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）