短語詞組短語permissible working stress 容許工作應力permissible U stress method 容許應力法permissible compression stress 許用壓應力Permissible shear stress 允許剪應力permissible tensile stress 許用拉伸應力permissible safety stress 安全許用應力permissible bending stress 許用彎曲應力permissible E stress 許可應力 返回 permissible stress