effective cross-sectional areaeffective sectional areanet sectional area有效: effective; valid; efficaciou ...截面: section; cross section; cros ...面积: area螺栓有效截面面积: ettectlve cross-section area of bolt; euler's critical load有效截面积: free area; net sectional area下载手机词典可随时随地查词查翻译
