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北京市环保局从1999年开始对北京的和进入北京的外地车辆，实行了更加严格的排放标准规定：CO在急速时新车排放不大于4％在用车不大于45％2000r·min时新车不大于2％，在用车不大于2．5％。HC在急速和2000r·min时．新车排放不大于700PPm在用车不大于900PPm按此标准．相当多的?
The Beijing Municipal Environmental Protection Bureau has imposed more stringent emission standards on Beijing’s foreign vehicles entering and entering Beijing since 1999. CO emissions are not more than 4% in rush hour. When the car is not over 45% at 2000r · min, the new car is not More than 2%, in the car is not more than 2.5%. HC at rapid and 2000r · min. New car emissions not more than 700PPm in the car is not more than 900PPm according to this standard. Quite a few?