How long will it take to make a coupling bolt?
做一个联轴器螺栓需要多长时间?
Effects on seismic strengthening of coupling beams with or without bolt connections in beam span
连梁抗震加固中梁跨内有无螺栓连接的影响
Study and Application of Bolt and Grouting Coupling Support Technique in Broken Soft Rock Roadway
破碎软岩斜井巷道锚网喷注耦合支护技术
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