heterodyne frequency meter
外差频率计

• 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
• smooth emission spectrum
• smooth finish
• smoothing tool
• smoothness
• smudge
• snap
• snap ga(u)ge
• snap-on red filter
• snap ring
• snapshot