Warning: file_put_contents(): Only 0 of 5340 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/52065.com/index.php on line 55 press mark是什么意思，press mark的翻译，press mark音标、读音、用法和例句_伍贰汉英词典
Crack nucleation and propagation in wear-resistant bainite ductile cast iron were investigated by press trace method and SEM. 採用壓痕法及掃描電鏡觀察，研究了抗磨貝氏躰球鉄中裂紋的形核與擴展。