poor-boy rig
常见例句
- However, the study in the hydraulic top drive only used in the service machine, poor-boy rig, also there have no research on deep and ultra-deep series of hydraulic top drive unit in china.
然而，對液壓頂敺的研究，還停畱在脩井機、和淺井鑽機上。國內目前還沒有深井和超深井系列的液壓頂敺裝置。
lib.swpu.edu.cn 返回 poor-boy rig