The Driller and the Derrickman must be able to communicate at all times when the Derrickman is working on the derrick board.
当井架工在二层台工作时，司钻和井架工一定要能时刻保持联系。
The Driller and the Derrickman must be able to communicate at all times when the Derrickman is working on the derrick board.
当井架工在二层台工作时，司钻和井架工一定要能时刻保持联系。
应用推荐