full width at half maximum
半极大处全宽度

• slow-scan vidicon camera
• slow speed thermocouple
• slurry
• small-angle camera
• small-angle prism
• small-angle scattering
• small-bore measuring microscope
• small difference colorimetry
• small field radiator
• small-format camera
• small-signal gain
• Smart Panel
• SMD LED surface-mount device LED
• smear
• smear camera
• smeared image
• smectic mesophase
• smectic phase
• smelting
• smelting furnace
• Smith chart
• Smith-Lagrange invariant
• smog
• smoked glass
• smooth circuit