roof bolt meaning in English

顶板锚杆
隧洞洞顶锚栓

Roof bolt plates for mining and tunnel support
矿井和遂道支撑用防护锚栓板
Research and development of new drilling bit for roof bolt driller
锚杆钻机新型钻头的研制
Galvanized mild steel roofing bolt and nut
镀锌瓦楞螺栓螺帽
Technique of combined supporting of roof bolting with bar and wire mesh in coal roadway
煤巷锚梁网组合支护技术的研究与应用
Expansion type roof bolt
膨胀式锚杆

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