Design a new outdoor fire hydrant, fire hydrants in the compound have been adopted in the multi-screw mechanism, the traditional fire hydrant to the transformation of the structure.
设计了一种新型室外消防栓，在消防栓中采用了复式螺纹机构，对传统的消防栓的结构进行了改造。
2
Significant effect has been obtained in 50 cases with scoliosis by the system by ourselves developed of multi-screw fixed distractor-compressor via the vertebral pedicle from Dec. 1989 to Dec.
采用自行研制的经椎弓根多钉固定撑压系统治疗脊柱侧凸50例取得显著疗效。
3
Introduced the optimized parameter of the multiscrew and the design technique progress of thrust bearing system.