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【单选题】
下列关于空间结构中轴线的表述中,不正确的选项是:( )
A.
轴线的长度有距离决定,轴线的方向是由节点的质量决定
B.
轴线有长度和方向
C.
轴线有密度的概念
D.
轴线是指交通线,轴线可以脱离节点而存在
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