单选题In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.Aa service tankBa settling tankCan expansion tankDa double bottom tank
单选题
In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.
A
a service tank
B
a settling tank
C
an expansion tank
D
a double bottom tank
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