Concrete was poured in separately from mid-span of arch slab to the supports and then from the supports to the top chord of the arch chord so as to balance the pouring load.
分两组由拱板下弦跨中同时向拱板支座浇筑混凝土，然后从拱板支座连续沿拱板上弦向中间合龙，使浇筑荷载相对均衡。
Then the structural accident of total section drive-through type crack is caused in arch frame top chord, which is induced by hoisting and detection using pulley arbitrarily.
铜绿山矿某三铰拱屋架单轨吊梁结构体系，因技术改造增加设备简体重量，随意用滑轮组起吊检修，导致拱架上弦全截面贯通式开裂的结构事故。
Based on the error theory, we strictly deduce where is the optimum measuring point and when the standard error of arch-height and that of chord - length are both defined in this paper.
本文从误差的传递着手，严密推证了弓高及弦长测量的标准差取不同值时最佳测量点的位置。
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%.
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%.
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％。
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