methods:in this group, we applied the skin soft tissue expansion to repair the tissue defect of head face neck.
方法:采用国产硅橡胶扩张器行皮肤扩张术,修复耳鼻和头面颈部软组织缺损。
the sealing trough and the sealing ring arranged on the head face of the upper mouth of the cup body have good sealing effect.
在杯体上口端面上所设置的密封槽、密封圈,具有很好的密封效果。
the analyses of this paper centers on the influence of the parallelism and roundness of the shaft surface, head face verticality on the load capacities.
研究了平行度、圆度和商面垂直度等制造误差对静态特性的影响;