bolt roof
短语词组
- king bolt bush post roof 单柱桁架屋顶
- roof bolt [矿业]顶板锚杆;隧洞洞顶锚栓
- Bolt and coble supporting roof 锚杆与锚索护顶
- roof bolt plate 锚杆垫板
- mine roof bolt 矿顶螺栓
- expansion type roof bolt 膨胀式锚杆
- split wedge roof bolt 叉楔顶板锚杆
- sliding wedge roof bolt 滑楔式锚杆 返回 bolt roof