单选题Fuel oil is regularly transferred to the day tank in order to （）Aallow impurities to settle out of the fuelBallow air to escape from the fuelCmake fuel available for immediate useDall of the above
单选题
Fuel oil is regularly transferred to the day tank in order to （）
A
allow impurities to settle out of the fuel
B
allow air to escape from the fuel
C
make fuel available for immediate use
D
all of the above
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