片语
roof beam support顶梁支架
roof caving support放顶煤支架
continuous roof support移动式支架
hydraulic roof support液压支架
powered roof support液压支架
roof support pattern顶板支护布置方式
sliding roof beam support滑移顶梁支架
light roof caving support轻型放顶煤支架
suspension roof support theory锚桿支护理论