Google dictionary has this information about the origin of ex: Submit a sample of academic writing, e.g., a dissertation chapter. But what is the origin of the usage as a prefix in the words.
Is short for exempli gratia, and is in common use to introduce an example within a sentence. 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. Does ex have a full form?
防爆标志ex de iic t6 gb的含义是:该电气设备具有防爆功能,采用隔爆和增安复合型防爆形式,适用于除煤矿外的其他爆炸性气体环境,其设备表面温度不超过85℃,且设备保.