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单选题
Increasing differential pressure of an oil filter indicates that （）
A
it is dirty
B
it is leaky
C
it has been renewed
D
all the above
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单选题The pressure differential across a diesel engine lube oil system duplex filter should be checked to （）A
determine the need for filter cleaningB
measure any change in oil viscosityC
prevent damage to the filterD
determine the need for batch filtration
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