坐放箍的内部部件一般由塑料、水泥和其它可钻材料制成。
The internal components of the landing collar are generally fabricated from plastics, cement and other drillable materials.
坐放箍的内部部件一般由塑料、水泥和其它可钻材料制成。
The internal components of the landing collar are generally fabricated from plastics, cement and other drillable materials.
应用推荐