采用声发射与声波对云南大姚铜矿盘区开采过程进行监测分析，用声彼仪对支撑顶板的点柱进行监测；
The panel mining process of Dayao Copper Mine, Yunnan was monitored and analysed with acoustic emission(AE)and acoustic wave (AW)methods.
液压支架不仅支撑顶板，推动刮板输送机工作面和自移式支架本身，而且还为相关的采煤设备提供一个安全的工作环境（略）。
The supports not only holds up the roof, pushes the face chain conveyor, and advances itself, but also provides a safe environment for all associated mining activities.
顶板横梁和A柱形成有管状主体部分和纵向地延伸的支撑凸缘。
The roof rail and A-pillar are formed with a tubular body portion and longitudinally extending support flanges.
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