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- 39.三線螺紋之導程為L，節距為P，則(A)P = 3L (B)P = 2L (C)P = L (D)
問題詳情
39.三線螺紋之導程為L，節距為P，則
(A)P = 3L
(B)P = 2L
(C)P = L
(D)
參考答案
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