Sign in
|
English
|
Terms of Use
Dictionary
Forum
Contacts
English
⇄
Chinese
G
o
o
g
l
e
|
Forvo
|
+
to phrases
classification of roof
expl.
顶板分类
在缓倾斜煤层中,根据顶板强度指数将直接顶分为不稳定、中等稳定、稳定和坚硬顶板4类, 根据直接顶厚度和采高的比值与老顶初次来压步距将老顶分为I、II、III、 IV 共4级
classification of roof:
1 phrase
in 1 subject
Technology
1
Add
|
Report an error
|
Get short URL
|
Language Selection Tips