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For conservative external nodal moments, the virtual work for the external moment can result in an external load stiffness matrix, which can significantly modify the geometrical stiffness matrix. 對(duì)於保守彎矩，節(jié)點(diǎn)外荷載彎矩的虛功産生外荷載剛度矩陣，這個(gè)矩陣會(huì)改變幾何剛度矩陣一些項(xiàng)。