electrophototgraphic technique
电子照相

• finite beam source
• finite linewidth
• finite object point
• finite ray
• finsen unit
• fipping frequency
• fire-control optics
• fire cracks
• fire-proof
• fireproof coating
• FIR-laser
• first angle projection
• first approximation
• first electron lens
• first eye lens
• first harmonic
• first-order
• first order aberration
• first order reflection
• first order spectrum
• first principal point
• first radiation constant
• first-scattering angle
• first side toric
• first surface mirror