Hanging roofs or high hang-ups, a common problem in sublevel caving mining, usually result in a large ore loss and under......

以乌石化公司热电厂锅炉补给水处理控制系统的安全性问题为研究对象，详细介绍了控制系统的原理、构成及曾经发生的各类故障，全面分析......

While roundabouts have already been proven to be an effective intersection treatment, there are many instances where low......