To determine if the lube oil filter elements need changing, （）.<br>A:open the filter and inspect the elements<br>B:check the lube oil pump discharge pressure<br>C:check the lube oil header pressure<br>D:check the pressure drop across the filter

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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