elbow refractor
(1)弯管折射器
(2)折轴折光计

• differential equation
• differential gain
• differential gear
• differential holographic interferometry
• differential indexing
• differential interferenc microscope
• differential interferometry
• differential laser interferometer
• differential method of measurement
• differential pendulum cam
• differential photometry
• differential planet gear
• differential pulse code modulation
• differential quotient
• differential refraction
• differential refractometer
• differential screw
• differential transformer
• differentiation
• differentiator
• diffracted beam
• diffracted ray
• diffracted wave
• diffracted wave vector
• diffracting mask