відносний донний тиск
base junction; rotary collector ring (box); rotary base junction (of a tank); rotary connection; slip ring; traverse rotary base junction
reduction ratio / gear ratio
Voltage Standing Wave Ratio (VSWR) / voltage standing-wave ratio
jam to signal ratio (J/S ratio)
engine pressure ratio (EPR)
pressure ratio
pressure ratio controller
reference pressure ratio
compressor pressure ratio (CPR)
defense industrial base / military-industrial base
naval base; naval operating base
base pressure
aspect ratio
fighter-to-administrative personnel ratio
high expansion-ratio
mass ratio
power-to-weight ratio
signal-to-noise ratio (SNR; S/N)
thrust-to-weight ratio
damping ratio
attenuation ratio
weight-horsepower ratio
weight-strength ratio
depression ratio
explosion ratio
infantry-armor ratio
forward gear ratio
fuel-air ratio
fuselage fineness ratio
compression ratio
excess air ratio
fuel hydrogen / carbon ratio