单项选择题
A.provide energy to operate the engine between power impulses
B.neutralize the primary inertia force of the crankshaft
C.reduce the shock of starting loads on the main bearings
D.prevent the engine from operating at critical speed
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 （）
单项选择题 The highest loads applied to the diesel engine crankshaft main bearings are （）