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美国环保局和交通部2011年8月9日发布最终法规,要求2014-2018年间生产的重型卡车及公交车提高燃油经济性,大幅削减CO2的排放量,即在4年内卡车和公交
The EPA and the Department of Transportation issued the final rule on August 9, 2011, to require heavy trucks and buses produced between 2014 and 2018 to increase fuel economy and substantially reduce CO2 emissions by truck and bus within 4 years