Having three equal axes intersecting at angles of60= in one plane and one axis of variable length that is perpendicular to the others.

 
  • 六方晶系的在一個(gè)平面內有三條等長(cháng)的相交成六十度角的軸線(xiàn)和一條與其它軸線(xiàn)垂直的長(cháng)度可變的軸線(xiàn)。
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