单词	球盒
释义	同Ballot-box
随便看	operation speed operations per minute operations per minute (opm) operations per minute {=opm} operations per minute，opm operations per second operations per second，oss operationsplan operations planning operations related outage operations research operations research cycle operations research dynamic programming operations research model operations research ; operational research operations research [= operational research] operations research (or) operations research {=or} operations research(or) operations research--or operations research{=or} operations research society of america operations research society of american operations research society of american (orsa) operations research society of america (orsa)