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来源: 于 2015-03-03 07:06:52 [旧帖] [给我悄悄话] 本文已被阅读：次

1970, CA's populationreached 20 million people. Total registered vehicles exceeded 12 million andvMT was 110 billion. Cumulative CA vehicle emissions for NOx and HCs were 1.6million tons/year.