dioptre
(=diopter)
(1)折光度，屈光度
(2)瞄准器，照准仪

• reversible level
• reversible level tube
• reversible medium
• reversible mirror
• reversible optical recording medium
• reversible prism
• reversible process
• reversible recording
• reversible spirit level
• reversible telescope
• reversible transformation
• reversible transit circle
• reversing clutch
• reversing dog
• reversing mechanism
• reversing prism
• reversing switch
• reversion
• revolution
• revolutionary
• revolution counter
• revolution meter
• revolver
• revolving axle
• revolving beam