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Bridge construction
containing
线对线
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主对角线
leading diagonal
主对角线
principal diagonal
对通过截面面积形心的轴线的一次静矩
statical first moment of cross-section area about axis through centroid of this area
矩阵主对角线
principal diagonal line of matrix
轴线对水平线的倾角
inclination of axis to horizontal line
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