自然老化和地震是影响房屋使用寿命的两个随机危险元。
Natural ageing and earthquake are the two random danger elements that influence the service life of building.
为大中修提供查勘、施工的可靠资料，最大限度地延长房屋的使用寿命，同时不断改善房屋的使用条件。
They should provide reliable information of survey and construction for repair and overhaul in order to prolong the usage period at most, to improve the living conditions.
摘要：屋面渗漏问题作为房屋使用中十大通病之一，不仅关系到房屋的使用寿命，还影响人们的日常生活和生产。
Abstract: Roof leakage problems as a house in one of the common use 10, is not only related to the service life of the house, still affect People's Daily life and production.
摘要：屋面渗漏问题作为房屋使用中十大通病之一，不仅关系到房屋的使用寿命，还影响人们的日常生活和生产。
Abstract: Roof leakage problems as a house in one of the common use 10, is not only related to the service life of the house, still affect People's Daily life and production.
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