On an international level there are a number of different types of crude oil, each of which have different properties and prices. The different types of crude oil come from regions as diverse as Alaska North Lope, Arab Light or Zueitina in Libya. For the purposes of trading on futures exchanges in London or New York, however, reference oils are used. These are standardized products used to determine the...
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por josepe0813 - hace 2 años
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