A dirty fuel oil filter element can be detected by （）<br>A:Visual inspection of the element<br>B:the pressure drop cross the filter<br>C:high fuel oil tank temperature<br>D:increase flow rate from the filter

A dirty fuel oil filter element can be detected by （）
A:Visual inspection of the element
B:the pressure drop cross the filter
C:high fuel oil tank temperature
D:increase flow rate from the filter

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