单轴对称截面
single symmetric section
singly symmetric sections
不对称十字形截面异形柱
asymmetrical cross-shape section column
单轴对称工字形截面
nonsymmetrical I-sections
对称矩形截面容器
symmetrical rectangle section vessel
非对称横截面
asymmetrical cross-section
不对称截尾平均数
asymmetrically trimmed mean
常对称面
ordinary plane of symmetry
common plane of symmetry