roof support
短语词组
- roof caving support 放頂煤支架
- sliding roof beam support 滑移頂梁支架
- light roof caving support 輕型放頂煤支架
- roof beam support 頂梁支架
- roof support pattern 頂板支護佈置方式
- powered roof support 液壓支架
- suspension roof support theory 錨杆支護理論
- hydraulic roof support 液壓支架
- continuous roof support 移動式支架 返回 roof support