Postal services-quality of service-measurement of the transit time of end-to-end services for single piece non-priority mail and second class mail 邮政服务.服务质量.单件非优先邮件和二级邮件全程服务运送时间的测量
Postal services-quality of services-measurement of the transit time of end-to-end services for single piece non-priority mail and second class mail; german version en 14508 : 2003 邮政服务.服务质量.单件非优先邮件和二级邮件全程服