题目内容
翻译:Aparaffinbasecrudeisanoilwhosechiefcomponentsareparaffins,andwhichcompletelydistilled,leavesasolidresidueofwax.Anasphaltbasecrudeisanoilcomposedprimarilyofcycliccompounds(mostlynaphthenes)which,whendistilled,leavesasolidresidueofasphalt.Oilswhichfallinthemiddleofthesecategroriesareclassifiedasmixedbase.
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