The central wedge-shaped stone of an arch that locks its parts together.
拱顶石，塞缝石拱的中部楔形石头，使拱的各个部分连在一起。
The building is equipped with central air-conditioning system, air system, computer management system, IDD, DDD telephone and IC electronic locks and other scientific and advanced hardware facilities.
楼内配有中央空调系统、新风系统、微机管理系统、IDD、DDD电话以及IC卡电子锁等科学先进的硬件设施。
The building is equipped with central air-conditioning system, air system, computer management system, IDD, DDD telephone and IC electronic locks and other scientific and advanced hardware facilities.
楼内配有中央空调系统、新风系统、微机管理系统、IDD、DDD电话以及IC卡电子锁等科学先进的硬件设施。
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