In a testing of petrolic engine, about 70% to 80% of nonmethane hydrocarbon is emitted into atmosphere without catalysis conversion in theoment of coldstart, so that serious pollution is produced.
在汽油机的一个测试,约占排放污染物总量70%~80%的非甲
碳氢化合物是在汽油机冷起
没有经催化转化而直接排入大气
,造成严重污染。