ISSN 2096-4498

   CN 44-1745/U

二维码
Analysis on System Error of Horizontal Angle Survey of CPII Track  Control Network of Long Tunnels and Countermeasures
DU Zhigang
Tunnel Construction . 2014, (12): 1191 -1195 .  DOI: 10.3973/j.issn.1672-741X.2014.12.012