The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass the lubricating orifices, during ______.
A.the upward stroke
B.the downward stroke
C.the power stroke
D.the suction stroke
第1题
A.fuel supply
B.firing order
C.engine load
D.oil level
第2题
A.visual inspection of the elements
B.the pressure drop across the filter
C.high lube oil sump temperature
D.decrease in oil viscosity from the filter
第3题
A.crankcase pressure
B.lube oil pressure
C.saltwater pressure
D.exhaust temperature
第4题
A.the cylinder weight
B.the cylinder bore
C.the cylinder length
D.the cylinder cover
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