单词	missives
释义	同missive
随便看	operational data collection system，odcs operational data store operational definition operational delay operational development force operational development force {= opdeveor} operational diskette operational display system operational display system--ods operational display system，ods operational diversification operational efficiency operational environment operational environment software operational ephemeris operational error analysis program operational error analysis program--oeap operational error analysis program，oeap operational evaluation operational expenditure operational factor operational factors operational failure operational fatigue operational feasibility