Warning: file_put_contents(): Only 0 of 5352 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/69228.com/index.php on line 55 {欧美换爱交换乱理伦片,亚洲国产一区二区三区在观看,国产妓女爱xx视频
However, for the specimen that has a sharp notch close to an ideal crack, the measured fracture toughness is not sensitive to the specimen geometry. 尖槽切口接近理想裂紋，裂紋起裂始於尖角的頂點，實測的斷裂靭度不存在尺寸相關(guān)性，即是材料常數(shù)。