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据新华社5月20日报道，当天美元对大多数主要货币汇率上涨，美元走强降低了以美元计价的石油的投资吸引力，给油价带来压力。
美国商业原油库存高企也给市场带来压力。美国能源信息局18日公布的原油数据显示，上周美国全国的商业原油库存增加130万桶至5.413亿桶。
科威特石油大臣18日表示，预计原油市场将在三四季度进行供需再平衡，油价在今年年底会达到50美元。
截至19日收盘时，纽约商品交易所6月交货的轻质原油期货价格下跌0.03美元，收于每桶48.16美元；7月交货的伦敦布伦特原油期货价格下跌0.12美元，收于每桶48.81美元。
