bolt roof

短语词组

短语

• 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
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