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介绍经三、四十年使用的钢筋混凝土厂房屋面板、薄腹梁、预应力拱形屋架和柱的加固方法，以及应遵循的原则
Introduce the reinforcement methods for the reinforced concrete plant house panels, thin webs, prestressed arched trusses and columns used in the past three or four decades, and the principles to be followed