counter spectromenter
(1)计数器能谱计
(2)计算器光谱计

• two-way radio
• two-way valve
• Twyman-Green interferometer
• Twyman interferometer
• twystron
• Tyndal scattering
• typesetter
• typotron
• Tywman green interferometers Tywman Green
• U-band
• U-bolt
• U-center(uniform chromaticity scale) diagra
• U-form tube
• Ulbricht integrating photometer
• Ulbricht sphere
• ultex
• ultifocus lens
• ultimate
• ultimate particles
• ultimate pressure
• ultimate range
• ultimate ray
• ultimate vacuum
• ultiplicator
• ultra achromatic lens