pit prop

常見例句

• A fork waveguide model is proposed and the mode matching and multi-mode network technique are used to analyze the transmission characteristics of rectangular tunnel with metallic pit prop.
  針對矩形巷道中由於金屬支護立柱的存在而帶來的分叉不連續(xù)問題,提出用分叉波導模型竝用模式匹配法和多模傳輸理論分析傳輸特性。
• a pit prop(= one used in a coal mine)
  煤鑛坑木
• The conservation of pit prop at ancient copper mine
  古銅鑛遺址地表坑木的保護
• The timber is used for construction, poles, vehicles, pit props, railway sleepers, and wood fiber.
  木材用於建設(shè)，桿，車輛，具窪點的支柱，鉄路睡眠者和木頭纖維。
• Effect of Metallic Pit Prop on Transmission Characteristics in Tunnel
  金屬支護立柱對巷道無線傳輸特性的影響
• The children were playing in the sand pit.
  孩子們在沙坑中玩耍。
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