ball defects per million是什么意思，ball defects per million的翻译，ball defects per million音标、读音、用法和例句

Warning: file_put_contents(): Only 0 of 5179 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/52065.com/index.php on line 55
ball defects per million是什么意思，ball defects per million的翻译，ball defects per million音标、读音、用法和例句_伍贰汉英词典