ripple frequencyripple voltageriscrise timerising sun magnetron anoderiskrj 11114rmsrms power per channelrnroamerrobotrobustnessrochelle salt crystalrockingrodrod rerialroentgenroentgen eqivalent physical equivalent roentgenroentgen equivalent manroentgen meterroentgen per hour at one meterroentgen rate meterroentgenographyrogerroget spiralrollroll and pitch controlroll offromronroof filterroom temperature vulcanizing silicinerootroot locusroot mean squareroot noderoot sum squarerooter amplifier root mean square effective valuerosin core solderrotaryrotary actuatorrotary beam antennarotary dialrotary fieldrotary jointrotary solenoidrotary switchrotary vane attenuatorrotary varible differntial transducer
