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目前我国屋面渗漏现象仍然十分严重,直接影响到人民生活和生产建设,屋面防水的研究工作己列为国家“七五”规
At present, the leakage of roofing in our country is still very serious, which directly affects people’s life and production and construction. Research work on roofing waterproofing has been listed as “Seventh Five-Year Plan”