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.<br>A:a service tank<br>B:a settling tank<br>C:an expansion tank<br>D:a double bottom tank

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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