mast derrick
常见例句
- Do not throw objects off the floor, mast or derrick.
不允許從鑽台上或井架上，往下亂扔東西。
blog.sina.com.cn - Do not leave pipe or collars that are not in use standing in mast or derrick.
不許在井架上排放用不著的鑽杆和鑽鋌。
blog.sina.com.cn - The frame of mast derrick that is designed for hydraulic wheel tractor hoist adopt welding of armor plate, its section is oblong armor plate, and its material is HG60.
爲滿足液壓輪式通井機的使用要求而設計的桅杆式井架採用板銲結搆， 主躰截麪爲長方形的方形鋼， 材料爲HG60。 返回 mast derrick