47 鈷鉻合金鑄造後之收縮率為何?
(A)0.5%
(B)1%
(C)1.7%
(D)2.3%
答案:登入後查看
統計: A(51), B(14), C(72), D(109), E(0) #902344
統計: A(51), B(14), C(72), D(109), E(0) #902344