背面铝 板表面设置有防腐层，增强其防腐效果，延长使用寿命。
The corrosion protection layer arranged on the surface of the back face aluminium plate enhances the corrosion protection effect of the utility model, thereby prolonging the service life.
在背面铝板表面设置有防腐层，增强其防腐效果，延长使用寿 命。
The corrosion protection layer arranged on the surface of the back face aluminium plate enhances the corrosion protection effect of the compound plate, thereby prolonging the service life.
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