pit prop

常见例句

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，杆，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。