79. 下列何種材料以車刀切斷時,車刀需有較大後斜角?
(A)鋼
(B)鋁
(C)銅
(D)鑄鐵
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統計: A(0), B(2), C(0), D(0), E(0) #2900098
統計: A(0), B(2), C(0), D(0), E(0) #2900098