Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）<br>A:sludge<br>B:water<br>C:micro-organism growth<br>D:all of the above

Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）
A:sludge
B:water
C:micro-organism growth
D:all of the above

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