mast derrick

常見例句

Do not throw objects off the floor, mast or derrick.
不允許從鉆臺(tái)上或井架上，往下亂扔?xùn)|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鉆桿和鉆鋌。
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.
為滿足液壓輪式通井機(jī)的使用要求而設(shè)計(jì)的桅桿式井架采用板焊結(jié)構(gòu)，主體截面為長(zhǎng)方形的方形鋼，材料為HG60。