通风管

• Dwv standard specification for coextruded composite drain , waste , and vent pipe
  共挤制复合排水排污通风管
• Technical specification of air duct
  通风管道技术规程
• My ventilation ducts will be too small to crawl through
  我所有的建筑物通风管道将会小到没有任何人爬的进去
• Ships drain plugs of vent pipes
  船用通风管路放水塞
• Make sure any ventilation or air - conditioning ducts are blocked by steel bars
  以钢枝封阻所有通风管或冷气槽等通道；
• It is light , convenient to move and suitable to produce duct
  它具有重量轻，移动方便的特点，适用于通风管道工程的制作。
• It ' s a ventilation shaft
  这是通风管道
• Mining equipment . flexible venting ducts . ventubes of the suction type . specifications
  采煤设备.吸入型通风管软管道.规范
• The drill may have hit a sealed shaft , away from the miners
  钻孔机在一个密封的通风管道前受阻，而这个管道离矿工们还很远。
• Technical specification for glass filer ventilation duct with magnesium oxy - chloride cement
  玻璃纤维氯氧镁水泥通风管道技术规程