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
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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
A.excessively late injection timing for each cylinder
B.incorrectly adjusted intake valve timing
C.incorrectly adjusted fuel injector
D.incorrectly adjusted intake valve clearance
A.Internally finned liner
B.Externally finned liner
C.Wet liner
D.Integral water-jacket liner
A.the water produced during combustion
B.the sulfur in the fuel
C.unburned fuel oil
D.all of the above
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