Warning: file_put_contents(): Only 0 of 6651 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/oclz.com/index.php on line 55 photographic density是什么意思，photographic density的翻译，photographic density音标、读音、用法和例句_菜篮子兴趣思朗文词典
For areas where the film density through the weld varies by more than from the density through the penetrameter, an additional penetrameter shall be used for those areas. 当焊缝区域底片黑度变化超过透度计处黑度时，应在该处另加透度计。