But what is the origin of the usage as a prefix in the words. Does ex have a full form? Is short for exempli gratia, and is in common use to introduce an example within a sentence.
Submit a sample of academic writing, e.g., a dissertation chapter. 防爆标志是设备的身份证,了解其含义有助于把握设备的防爆级别和适用环境。那么,ex db ib iic t4 gb代表什么? ex标志表明设备具有防爆性能,这是防爆设备的必备标. 防爆标志ex d iic t6 gb是一个详细的电气设备防爆标识,它由多个部分组成。 ex是中国及国际电工委员会的防爆标志,表示该设备遵循gb3836和iec60079的防爆标准。 d代.
Google dictionary has this information about the origin of ex: