問題詳情
25. 關於SAE3125材料之編號，下列敘述何者有誤？
(A) SAE是美國汽車工程學會標準的簡稱
(B)第1個數字表示鋼的種類，而3是指鎳鋼
(C)第2個數字表示主要合金元素之大約成分
(D)第4個數字表示平均含碳量為0.25 %
(A) SAE是美國汽車工程學會標準的簡稱
(B)第1個數字表示鋼的種類，而3是指鎳鋼
(C)第2個數字表示主要合金元素之大約成分
(D)第4個數字表示平均含碳量為0.25 %
參考答案
無參考答案
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