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- 什么是dBm，与dB、dBW的区别? - 知乎
dB定义为任意两个给定点之间的功率或信号强度之差，而dBm则定义为功率的绝对值或强度，用于确定特定点的信号强度。 与dB不同，dBm是绝对测量单位。 dB代表一个相对数字，表示信号强度的增加或减少。 dBm表示在给定点上（相对1mw）信号强度的绝对度量。
- *. db是什么文件，如何打开？ - 知乎
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
- File extension . DB - What kind of database is it exactly?
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 file 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
- What is the difference between *. sqlite and *. db file?
24 A sqlite file is as the name implies a file that contains an SQLite database The db file extension is used by Oracle, Paradox and XoftSpySE databases [1] As Christian noted usually extensions aren't that important in the grand scheme of things and programs can open files with different extensions
- How to create a DB link between two oracle instances
How to create a DB link between two Oracle instances Let's say A and B are two instances I want to access the data in instance B from the instance A
- 噪声测量中dB 和 dBA 有什么区别？ - 知乎
做一下搬运工 dB，只是理论上的值。在现bai实中，必须要通过一du定的设施进行zhi测量才知道结果。为了照顾人的感觉，分别设计了dao三种计量（实际就是计权）方式，并按此方式设计了计量设备。所以在现实中测出来的只能是dB (A)，不存在dB 根据所使用的计权网不同，分别称为A声级、B声级和C声级
- How to connect Python to Oracle using oracledb - Stack Overflow
I'm trying to connect to Oracle using using the following Python script: import oracledb connection = oracledb connect(user = 'user', password = 'PW',
- Opening database file from within SQLite command-line shell
sqlite3 data db I cannot figure out how to open a database file from within the tool after having invoked it without supplying the file as a command-line argument (if I, say, double-click sqlite3 exe in Windows) What is the command within the SQLite shell tool to specify a database file?
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