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[5]CentersforDiseaseControlandPrevention.Currenttobaccouseandsecondhandsmokeexposureamongwomenofreproductiveage--14countries,2008-2010[J].MMWR.Morbidityandmortalityweeklyreport,2012,61(43):877.
未加尿素的国四PG1H辆比加了尿素的ECe8四车辆NOx排放高出3-4倍;未加尿素的国五车g489比加了尿素的国Ipo3车辆NOx排放高出5-7倍。