問題詳情
18.自軸線的一端來看，依順時針方向旋轉，外螺紋向前行進，此螺紋稱為
(A)右螺紋
(B)複螺紋
(C)單螺紋
(D)左螺紋。
(A)右螺紋
(B)複螺紋
(C)單螺紋
(D)左螺紋。
參考答案
無參考答案
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