Warning: file_put_contents(): Only 0 of 4994 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/69228.com/index.php on line 55 久久欧美日韩国产,99国产精品偷窥熟女精品视频
Beyond the yield point, the material will continue to deform, but with less stress than before, because the material has begun to yield. 超過屈服點之后，材料會繼續(xù)變形，但是因為材料開始屈服，應(yīng)力會減小。