commutator
(1)换向器
(2)整流器
(3)转接器，转换开关

• standard light sources
• standard luminosity function
• standard mandrel
• standard meridian
• standard of flatness
• standard refraction
• standard source
• standard speciamen of surface roughness
• standard specification
• standard/stabilized light sources
• standard temperature and pressure
• standard unit
• standard wavelength
• Standard Wire Ga(u)ge
• stand-by
• standing wave
• standing-wave detector
• standing-wave feature
• standing-wave field
• standing-wave laser
• standing-wave ratio
• stand-off ratio
• star
• star and sky simulator
• star connector