单词	學到完全地步
释义	同ATTAIN
随便看	operational service state operational settings operational sign operational specification operational speed operational staff operational staff study operational stage operational standby program operational-stop instruction operational store operational strategy operational subsystem operational support operational support and analysis operational support directive operational support directive，osd operational support equipment operational support equipment--ose operational support equipment，ose operational support system operational symbol operational symbol -- operative symbol operational symbol ; operative symbol operational system development