单选题A substantial increase in crankcase pressure could be an indication of （）Aexcessive lube oil pressureBthe proper seating of new ringsCa worn cylinder linerDa malfunctioning cylinder relief valve
单选题
A substantial increase in crankcase pressure could be an indication of （）
A
excessive lube oil pressure
B
the proper seating of new rings
C
a worn cylinder liner
D
a malfunctioning cylinder relief valve
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