基本解釋[經濟學]桅式吊車英漢例句雙語例句Do not throw objects off the floor, mast or derrick.不允許從鉆臺上或井架上,往下亂扔東西。blog.sina.com.cnDo 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鉆桿和鉆鋌。blog.sina.com.cnThe 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.為滿足液壓輪式通井機的使用要求而設計的桅桿式井架采用板焊結構, 主體截面為長方形的方形鋼, 材料為HG60。mast derrick更多例句詞組短語短語mast or derrick 井架guyed -mast derrick [機]把桿起重機mast -shaped derrick 桅桿式井架single -mast derrick 單桅桿鉆塔the single -mast derrick 單桅桿鉆塔mast derrick更多詞組專業(yè)釋義經濟學桅式吊車