It involved the construction of about 50,000 tube Wells in the fadama lands for small scale irrigation, as well as simplifying the drilling technology for the tube Wells.
项目的内容包括新建50000个机井，用于“发达玛”地带的小型灌溉，同时简化打井技术。
2
The production has been nearly 20 years from the time scale of vacuum tube, product structure, process and equipment has been very mature, the thermal performance of the already very difficult.