调查坑道
- 网络survey tunnel; investigation gallery
调查坑道调查坑道
survey tunnel
... 横通道 transverse passage-way 调查坑道 investigation gallery； survey tunnel 竖井联系测量 shaft connection survey ...
investigation gallery
... 横通道 transverse passage-way 调查坑道 investigation gallery； survey tunnel 竖井联系测量 shaft connection survey ...