a high strength long bolt
a high strength long bolt
高强度长螺栓
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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This paper introduced a combined supporting technology, including first supporting, high-strength bolt-net-cable supporting, second supporting, long ring support and grouting behind support.
介绍了该矿采用的高强锚网索一次支护、长环形支架二次支护以及壁后注浆的联合支护技术。
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