... element of matrix 矩阵元 elementary beam 元光束 electrostatic field intensity 静电场强度 ...
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Gaussian elementary beam 高斯基本光束
beam of elementary particles 粒子束
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The vibration frequency of box gird is usually calculated by the elementary beam theory, but it will lead to a large error because of the existence of shear lag effect and shear deformation.
由于剪力滞效应及剪切变形的存在，箱梁的弯曲振动频率按照初等梁理论计算往往存在较大的误差。
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