機械加工前，劃線臺上之劃針以何種鋼材經加工及熱處理為最佳？(A)工具鋼 (B)不銹鋼 (C)低碳鋼 (D)高碳鋼

問題詳情

2. 機械加工前，劃線臺上之劃針以何種鋼材經加工及熱處理為最佳？
(A)工具鋼
(B)不銹鋼
(C)低碳鋼
(D)高碳鋼

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