Web Reference: Oct 3, 2013 · 如果我们用dB来表示的话，第一种情况增大了3dB，而第二种情况增大了10.4dB，更能客观地反映出人的感官的感觉特性。 而在电子工程技术领域，dB是国际上统一使用的电信传输单位。 12 If you're on a Unix-like platform (Mac OS X, Linux, etc), you could try running file myfile.db to see if that can figure out what type of file it is. The utility will inspect the beginning of the file, looking for any clues like magic numbers, headers, and so on to determine the type of the file. 后缀是.db的文件是数据库文件，db是datebase的缩写，datebase的意思就是数据库。 数据库类型包括： 关系数据库、 非关系型数据库 （NoSQL） 关系型的有：Oracle，MySQL， SQLServer 等 非关系型有：Redis，mongoDB 有专门数据库管理和设计工具可以打开，比如说：Navicat就可以打开
YouTube Excerpt: In this video we cover the two
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