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第二种交叉梁是所有横梁断面惯性矩相同、间矩相等而纵梁的断面惯性矩、间距则是任意的。
In the second case, all the transversal beams are arranged inequidistance and have the same stiffness, while the longitudinal beams arearraseed in arbitrary distances and have different stiffness.
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