单选题To determine if the lube oil filter elements need changing, （）.Aopen the filter and inspect the elementsBcheck the lube oil pump discharge pressureCcheck the lube oil header pressureDcheck the pressure drop across the filter
单选题
To determine if the lube oil filter elements need changing, （）.
A
open the filter and inspect the elements
B
check the lube oil pump discharge pressure
C
check the lube oil header pressure
D
check the pressure drop across the filter
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