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Divisional planes

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

Divisional \Di*vi"sion*al\, a.
   That divides; pertaining to, making, or noting, a division;
   as, a divisional line; a divisional general; a divisional
   surgeon of police.

   {Divisional planes} (Geol.), planes of separation between
      rock masses. They include joints.
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