结论：以牙槽孔至颧下嵴起始部的弧长和弦长为标准弯制注射针头，采用口内注射法进行上牙槽后神经阻滞麻醉，成功率为98％。
Conclusion: We use L as arch length and H as chord length to bend syringe needle that is used to posterior superior alveolar nerve block anesthesia by intraoral injection. The success rate is 98%.
一设置于转动单元凹 槽中的推动单元，该推动单元上具有一长孔；
A push unit which is provided with a long hole is positioned in the groove of the rotation unit.
分析了爬波的波型特征，制作了带长横孔和刻槽孔和刻槽缺陷的焊缝试块，对薄壁焊缝的爬波检测技术进行了试验研究。
The creeping wave characteristics were analyzed, the artificial welding blocks with long-hole and curve were made, and the trials were proceeded on the blocks.
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