main stair

基本解释

The information center program is on the second floor so the Main exterior stair is link directly from the plaza that opens to the public.
信息中心功能在二楼，因此主外部楼梯直接连接向公众开放的广场。
There are four key points of plate spiral stair design, and they are model building, inner force calculation, overall stability analysis and joints design between the stair and the main structure.
对板式钢结构旋转楼梯的有限元计算进行了全面的分析，并对其与主体结构的连接节点进行了设计。
Doors of engine casing and stair casing on main deck are of fire doors with self-closing device.
主甲板机舱棚围壁和梯道环围等处安装的门为带闭门器的防火门。