Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
Chinese
⇄
English
G
o
o
g
l
e
|
Forvo
|
+
上部超前掘进-下向回采
一种掘进方法,其上部或上平巷先掘至全长,然后再扩大其余部分。这种爆破方法用于掘进平硐、隧道和平巷
expl.
top heading-underhand stoping
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">
Add
|
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">
Report an error
|
Get short URL
|
Language Selection Tips