单选题The percentage of impurities in a specific fuel oil sample is determined by （）.Asettling in a fuel tankBtesting in a laboratory centrifugeCburning in a calorimeterDtesting in a closed cup
单选题
The percentage of impurities in a specific fuel oil sample is determined by （）.
A
settling in a fuel tank
B
testing in a laboratory centrifuge
C
burning in a calorimeter
D
testing in a closed cup
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