单选题Fuel oil day tanks for diesel engines must be checked and cleaned and cleaned at regular intervals in order to remove（）AsludgeBwaterCmicro-organism growthDall of the above
单选题
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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