wavelength spectrometer
波长分光计

• fail-safe performance
• failure
• failure of oscillation
• faint haze
• falling
• falling body
• fall time
• false alarm
• false-color
• false-color film
• false color process
• false image
• false light
• false radiation
• false reflection
• family of curves
• family of ellipses
• family of half-curves
• fan
• fan antenna
• fan beam
• fan dial
• fan filter
• fan geometry mixing laser
• fan in