Report - 機械製圖基礎知識講解 - aidauto.cn · 比例:為方便加工,零件圖常采用1:1的比例 • c.尺寸:工程圖的單位是毫米mm一般不寫. • 讀圖時常見圖中標有R.Ǿ,SR,SǾ等符號它們分別代表半徑,直

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