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68. Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?
Centrifuging effectively removes sludge from diesel fuel because sludge consists of heavier solid contaminants and water, which are separated based on density differences. Fuel purifiers are designed for this purpose, while separating hydrocarbons like lube oil, gasoline, and fuel oil is not achievable with standard centrifuging methods due to their similar densities and mutual solubility.
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