Page 9 - index

UndergroundSpace

2011 12 31

31037

5699

10

2013 7
(2013-2020) ( ) 45 ( )
2020
42
2020 10

1 2

887km 2
1 2 4.95 8.56
1220km 2
6.85 11.82

10
2020 4
2020 1 2
4 5 6 3 4
48

IssueNo.5 2013 ShieldTunnellingTechnology 5