Warning: file_put_contents(): Only 0 of 5103 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/52065.com/index.php on line 55 densitometer英英字典_densitometer剑桥英语解释_densitometer柯林斯英文解释_伍贰汉英词典
1. N an instrument for measuring the optical density of a material by directing a beam of light onto the specimen and measuring its transmission or reflection 光密度计