External spiral escape stairs are made of steel and for safety reasons around the ladder there is a steel frame and the protective mesh.
而外凸的旋转疏散楼梯采用钢制结构，为了安全起见，阶梯被一圈钢制框架包裹。
Because the protective layer is too large, the steel mesh can not play the role of anti crack, the protective layer is too small, easy to cause the cracks in the bridge deck pavement.
因为保护层过大，钢筋网起不到抗裂作用，保护层过小，容易引起桥面铺装裂缝。
The mesh point clarity is high, the automatic control exposure time, in sets at the shutter protective device.
网点清晰度高，自动控制曝光时间，内置快门保护装置。
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