dd缩写的意思

C/E MPFI S/O VICS AFR B/N PM f.i.o.s. SUV SP SCR APC CVT TCLU TVO SA MIL MCS ISSC EBD f.0.w. UHVI NB OHC HPF f.i.w. CCD VASI SLS FPA S/P c/- OX1 AC VRCV DT&E HB/L 1PPM ASR RTCM MPI M/F IMC C.I.F.E. HERMES SSS ST CCL BIMCO CL HAI AMI TFV TAP TDOP HO ATC D/R FAS RC