短語詞組短語king bolt bush post roof 單柱桁架屋頂roof bolt [礦業(yè)]頂板錨桿;隧洞洞頂錨栓Bolt and coble supporting roof 錨桿與錨索護頂roof bolt plate 錨桿墊板mine roof bolt 礦頂螺栓expansion type roof bolt 膨脹式錨桿split wedge roof bolt 叉楔頂板錨桿sliding wedge roof bolt 滑楔式錨桿 返回 bolt roof