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长梁:可分为无限长梁、半无限长梁。当换算长度λ≥2.75时,属于长梁;若荷载作用点距梁端的换算长度均不小于2.75时,可忽略该荷载对梁端的影响,为 ?若荷载作用点仅距梁一端的换算长度不小于2.75时,可忽略该荷载对这一端的影响,而对另一端的影响不能忽略,为 , 可化为两个 。
A.
无限长梁; 半无限长梁;半无限长梁;无限长梁
B.
无限长梁; 半无限长梁;无限长梁;半无限长梁
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