... 闭平面 close plane 闭平面图形 closed plane figure 闭平面域 closed plane domain ...
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提出了一种关于自由度平面闭链机构的构型方法，即“平面图形构造方法”。
This paper puts forward a kind of method about type synthesis of the one dof planar closed chains mechanisms, that is , "type synthesis by planar graph".
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