Insulation power factor
绝缘功率因数

• ring mode
• ring oscillator
• ring resonator
• ring-shaped aperture
• ring spacer
• rinsing
• riometer
• ripple
• ripple amplitude
• ripple patern
• ripple ratio
• riser
• risetime
• rise-time switching
• rising characteristic
• Risley prism
• Ritchey-Chretien objective
• Ritchey-Chretien telescope
• Ritchie prism
• rivet
• rivet connection
• riveting
• rivet joint
• r.m.s roughness
• road level