S/D缩写的意思

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