介绍了回采巷道复合顶板条件下采用小直径管缝式锚杆加钢筋梯式组合网支护的原理、方法和取得的经济效果。
The paper introduced the principle and methods of supporting combined the slit wedge bolt in small diameter with steel reinforcement in roadway with compound roof, and obtained economic effects.
我们提供了国内梯型丝杆业界最完善的产品系列服务。
We provide the domestic ladder screw products the industry's most comprehensive range of services.
我们提供了国内梯型丝杆业界最完善的产品系列服务。
We provide the domestic Tixing screw the industry's most complete product line services.
电工梯、电缆托架、电线牵引棒、电线分拨杆、开关插销、伸缩杆等电工电器用品；
Electrician ladder, cable bracket, wire traction stick, switch bolt, flex pole and other electric products;
电工梯、电缆托架、电线牵引棒、电线分拨杆、开关插销、伸缩杆等电工电器用品；
Electrician ladder, cable bracket, wire traction stick, switch bolt, flex pole and other electric products;
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