The TLV-TWA for CO 2 , 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%.是什么意思_The TLV-TWA for CO 2 , 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%.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句