The basket price of the seven OPEC crudes Monday fell to 27.
Opec七個成員國,星期一提供的原油價格為27.98美元一桶.
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Analysts say It'shut in cheaper, heavier crudes in order to preserve profit margins.
分析人士表示,它減少了價格較低的重質(zhì)原油的生產(chǎn),以保持利潤率.
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