菲律宾颜色程度10颗星的电影,久久久久久久久久久夜色,日韩性无码,国产精品另类专区

The role of light has the four aspects:
1, the pressing strip surface, make the zinc layer better stick to the strip surface;
2, control panel, improve product quality;
3, improve the strip steel mechanical properties, eliminate the yield platform;
4, roughness, make it easier for steel strip after finishing antirust processing.