Two kinds of PVA solution, which have different polymerizing degrees, are mixed with ammonium dichromate to obtain a high-resolution, water-proof developing photosensitive glue solution.
本发明方法是用两种不同聚合度的聚乙烯醇溶液与重铬酸铵混合，得到高分辩率的、耐水冲洗显影的感光胶液。
Solution: find leaking holes using black glue point blocking.
解决方案：查找漏水孔使用黑胶点堵。
Solution: in addition to the replacement type color steel tile extra, can only use the glue sealing at roof.
解决方案：除了更换彩钢瓦型号外，只能在屋脊处用胶封堵。
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