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U型钢拱形可缩性支架技术条件和试验方法
Specification and experimental method for yielding U.section steel support in arch-shaped
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煤矿预应力锚固施工技术规范
Technical specification of coal prestressed anchoring construction
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水泥锚杆.杆体
Cement anchor bolts-Bars
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矿用W型钢带
W-section steel straps for coal mine
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