The percentage of impurities in a specific fuel oil sample is determined by （）.<br>A:settling in a fuel tank<br>B:testing in a laboratory centrifuge<br>C:burning in a calorimeter<br>D:testing in a closed cup

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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