But with the same length of straight seampipe than the weld length of 30 ~ 100%, and lower production rate.
但是与相同长度的直缝管相比,焊缝长度增加30 ~ 100%,而且生产速度较低。
2
The early eighties the Beijing Research Institute to build Wells conducted in the laboratory experiments to explore seampipe bolt achieved good results.
八十年代初,北京建井钻研所在实验室进行了缝管锚杆探索实验取得了良好效果。
3
The early eighties, the Beijing Research Institute to build wells conducted in the laboratory experiments to explore seampipe bolt achieved good results.