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离题万里
Re: 专家称北京净霾塔每小时吸霾不足一勺盐重:不如找块布盖工地
by
flyboy580
on
21/10/2016, 05:56:44 UTC
PM2.5浓度为200微克每立方米,该塔每小时吸收PM2.5总量为4.5克,等于每小时净化了22500立方米空气啊