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