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六十年代初人们就已经认识到燃料燃烧产物中NO_x对大气的污染,并开始进行了 T_1(某物质的有害度)=有害物质同时存在,应考虑综合有害度,其
At the beginning of the 1960s, people realized that NO_x in the fuel combustion products would pollute the atmosphere and started T_1 (the degree of harmfulness of a certain substance) = the harmful substances exist at the same time. The comprehensive degree of harmfulness should be considered.