機械製圖中標示ㄧ螺紋規格為「L-2N M14×1」，下列敘述何者正確？(A)右旋雙線粗螺紋 (B)左旋雙線粗螺紋 (C)右旋雙線細螺紋 (D)左旋雙線細螺紋

問題詳情

3. 機械製圖中標示ㄧ螺紋規格為「L-2N M14×1」，下列敘述何者正確？
(A)右旋雙線粗螺紋
(B)左旋雙線粗螺紋
(C)右旋雙線細螺紋
(D)左旋雙線細螺紋

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