AD缩写的意思

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