Objective: to explore a better material for repairing perforation of pulp bottom.
目的：寻求修复髓室底穿孔较理想的修复材料。
AIM: to explore a better material for repairing perforation of pulp bottom.
目的：寻求修复髓室底穿孔较好的修复材料。
Objective to explore an effective method for root canal filling and repairing perforation of pulp bottom.
目的寻求有效的充填根管及修复髓室底穿孔的材料。
Bell and Howell perforation: a film perforation shaped with flat top and bottom and curved sides.
贝尔浩型片(齿)孔：上下平行两边弯曲的胶片齿孔。
For a well producing from reservoir with bottom water and gas cap, the water and gas avoidances must lie taken into consideration for its position of optimum perforation.
气顶底水油藏油井射孔时既要考虑避水，又要考虑避气，因此存在一个最佳射开位置的问题。
Therefore, the barrier distribution should be taken into consideration for the perforation of reservoir with bottom water and gas cap.
气顶底水油藏油井射孔时既要考虑避水，又要考虑避气，因此存在一个最佳射开位置的问题。
Therefore, the barrier distribution should be taken into consideration for the perforation of reservoir with bottom water and gas cap.
气顶底水油藏油井射孔时既要考虑避水，又要考虑避气，因此存在一个最佳射开位置的问题。
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