OP缩写的意思

PTT TA BL DT XQ CBC TESOL CFR A-level BAEE AAS ADELAIDE LA PG MSME ALR WP UofMELB B.Eng UD OT ADIDA M.A.Ed PE TWE M.I.E. MCAT TFF B.S.Ed ESP AR ABC WD AQ DILS OP AC AIE ME CTC NSA DNA SWJTU ORC B.Eng.Mgt UQ ROI BEC HE B.RM AD CLEP RA HKUST NJTV MJ AJED UC M.Ec. AAU