diversion tunnel and spillway tunnel
option of separate highway tunnel and Metro tunnel
Part-tunnel and Part-roadbed Type Tunnel
power tunnel and tailrace tunnel system
railway tunnel under crossing the highway tunnel
Shield Tunnel and Rock Tunnel
water tunnel and salt tunnel
1221 upper working face
8-axis cooperatively working
9Cr2Mo forged cold-rolled working roll
A and B male sterile line capable of working as a
a connected sequence of working way
a working model of coaching effectiveness
Abnormal working condition
abrasive wear working system
access into working chamber under compressed air