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从三次平面等参元出发，构造出角结点有旋转自由度的高精度矩形单元。该单元与平面等参元具有相同的单元特征及精度，同时具有连续介质力学中关于旋转度的定义。
Starting from the cubic isoparametric element, a high-precision rectangular element with a rotational degree of freedom is constructed. The unit has the same element characteristics and accuracy as the planar isoparametric element, and has the definition of the degree of rotation in continuum mechanics.