bolt roof

短语词组

短語

• 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
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