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