The exhaust valve opens before bottom dead center in a four stroke engine to() Ⅰ.allow for blow down Ⅱ.Reduce pumping losses
A.Ⅰ only B.Ⅱ only C.both Ⅰ and Ⅱ D.neither Ⅰ nor Ⅱ
A.Constant volume B.Constant pressure C.Pulse pressure D.Radial flow
A.Water discharging from the water outlet of the lube oil purifier B.Fuel oil discharging from the water outlet of the lube oil purifier C.Lube oil discharging from the water outlet of the lube oil purifier D.A change in the lube oil viscosity