diversion tunnel and spillway tunnel
option of separate highway tunnel and Metro tunnel
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
accession working group
acid-proof working suit