超前导洞
Safety measures about single pilot heading are put forward, and it is verified through engineering example that single pilot heading construction method is feasible, reliable, and appliable.
提出了单导洞安全问题的解决措施;通过工程实例验证了单导洞施工法的可行、可靠、优异、实用性。
微语录 · 唯美句子
微语录 · 句子大全
微语录 · 生活常识
微语录 · 经典语录