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。
The utility model is a safety device, which has the functions of self closing and emergency escape.
它是一种安全设施，具有自闭功能和紧急逃生功能。
The utility model is a safety device, which has the functions of self closing and emergency escape.
它是一种安全设施，具有自闭功能和紧急逃生功能。
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