上QQ阅读APP看本书，新人免费读10天
设备和账号都新为新人
PROFESSIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA FOR TELECOMMUNICATION
Installation and Design Standard for Cabling Duct in the Room of Telecommunication
YD/T 5026-2005
Competent Department:Comprehensive Planning Department of the Ministry of Information Industry
Approval Department:Ministry of Industry and Information
Technology of the People s Republic of China
Implementation Date:October 1，2006
China Planning Press
Beijing 2019