requ - rock
- required burning area
- required thrust
- RES
- rescue crew
- research apparatus
- research rocket
- reserve parachute
- residual contamination
- residual fuel
- residual ionization
- residual speed
- resilience
- resolution
- resolver
- resolving power
- resonance frequency
- resonance radiation
- resonance rod
- resonant burning
- respiration depth
- respiration rate
- response
- restartable rocket engine
- resting frequency
- restoring force
- restrain adaptation
- restraint system
- restricted grain
- restricted theory of relativity
- restricted-burning charge
- restricted-burning solid propellant rocket
- resultant error
- retention mechanism
- retentivity
- retentivity of vision
- reticle
- retinal adaptation
- retractable launcher
- retroactive rocket
- retroengine
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