bolt roof
短语词组
- king bolt bush post roof 單柱桁架屋頂
- roof bolt [鑛業]頂板錨杆;隧洞洞頂錨栓
- Bolt and coble supporting roof 錨杆與錨索護頂
- roof bolt plate 錨杆墊板
- mine roof bolt 鑛頂螺栓
- expansion type roof bolt 膨脹式錨杆
- split wedge roof bolt 叉楔頂板錨杆
- sliding wedge roof bolt 滑楔式錨杆 返回 bolt roof