問題詳情
60 牙科金屬材料冷加工率(percentage of cold work)提高時,那些機械性質也會提高?①伸長率(elongation) ②拉伸強度(tensile strength) ③硬度(hardness) ④斷面縮率(percentreduction in area)
(A)①②
(B)①④
(C)②③
(D)③④
(A)①②
(B)①④
(C)②③
(D)③④
參考答案
答案:C
難度:適中0.490566
統計:A(12),B(0),C(26),D(8),E(0)
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