| RRT | random response technique; Registered Respiratory Therapist; relative retention time |
|---|---|
| RTC | random control trial; rape treatment center; renal tubular cell; residential treatment center; retur... |
| RV | random variable; rat virus; Rauscher virus; rectovaginal; reinforcement value; renal vein; residual ... |
| s2 | sample variance |
| SEM | sample evaluation method; scanning electron microscopy; secondary enrichment medium; standard error ... |