yieldable arch可缩性拱形支架
yieldable lining可缩性衬砌
yieldable coordinate可缩协调性
yieldable support可缩性支架
yieldable steel sets可缩性钢支架组
yieldable steel arch可缩性金属支架
Yieldable hinged support多铰可缩支架
yieldable arch steel support拱型金属可缩性支架
coupling yieldable support耦合让压支护