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UG NX12.0 零基础建模入门 第五讲 草图的尺寸标注及几何约束一
UG NX12.0 零基础建模入门 第五讲 草图的尺寸标注及几何约束（一）
UG NX12.0零基础建模入门 NX软件基础及草图功能5/21
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