bolt roof
短語詞組
- 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