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Plug board

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Plug \Plug\, n.

   {Breech plug} (Gun.), in breech-loading guns, the metal plug
      or cylinder which closes the aperture in the breech,
      through which the gun is loaded. Plug board \Plug board\
   (Elec.)
   A switchboard in which connections are made by means of
   plugs.
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