individual prop造句

• Mine support ; valves for individual props ; identification code
  矿井支撑物.单立支撑的阀门.标识代码
• Design of roof controlling in individual props face in huaibei mining bureau
  淮北矿区单体液压支柱工作面控顶设计
• The strata behavior rule of longwall face with individual props in shallowly buried coal seam covered with thick soil was summarized
  实验和观测表明，尽管其上覆岩层的力学强度比较小，煤层埋深浅，但工作面初次来压步距大，矿山压力显现剧烈，周期来压台阶下沉量大。