ISO 13347-32004 Industrial fans -- Determination of fan sound power levels under stan- dardized laboISO 13347-32004 Industrial fans -- Determination of fan sound power levels under stan- dardized laboratory conditions -- Part 3 Enveloping surface methods
部份国外标准涉及版权问题,所以全部国外标准于2013年02月,全部删除!相关页面仅提供参考消息。