井下

• Verification regalation of the oscilating string pressure gauge
  振弦式井下压力计检定规程
• Plastic net protecting top - plane in coal mining
  煤矿井下用塑料网假顶带
• Mine plans ; deep mining ; underground workings ; comments
  矿区平面图.深井开采.井下巷道.说明
• Technical standard of thermal packer and expansion joint
  注蒸汽封隔器及井下补偿器技术条件
• About 100 workers managed to escape the flood
  大约100名井下矿工在透水事故发生时得以逃脱。
• The application of the plc in mine data communication
  电力线载波系统在井下数据通信中的应用
• Belt conveyors for underground coalmining - heavy construction
  井下采煤皮带输送机.重型支架
• Preliminary discussion on how to prevent underground coal mine dust
  浅谈煤矿井下粉尘的治理
• Test of glass fiber reinforced
  煤矿井下用玻璃钢制品安全性能检验规范
• An analysis of the multi - fold method for gpr exploration
  探地雷达方法应用于煤矿井下断层探测