The TLV-TWA for CO2, as listed by American Conference of Governmental Industrial Hygienists and by the Occupational Safety and Health Administration, is 5000 parts per million, or 0.5%.The CAS # for CO2 is 124-38-9.是什么意思_The TLV-TWA for CO2, as listed by American Conference of Governmental Industrial Hygienists and by the Occupational Safety and Health Administration, is 5000 parts per million, or 0.5%.The CAS # for CO2 is 124-38-9.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句