Warning: file_put_contents(): Only 0 of 6167 bytes written, possibly out of free disk space in /www/wwwroot/ppbbbu/202081.com/index.php on line 55 press mark例句_press mark英汉例句_press mark双解例句_2020年的事情英文词典
Crack nucleation and propagation in wear-resistant bainite ductile cast iron were investigated by press trace method and SEM. 采用压痕法及扫描电镜观察，研究了抗磨贝氏体球铁中裂纹的形核与扩展。