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(49), B(14), C(71), D(108), E(0) #902344
統計: A(49), B(14), C(71), D(108), E(0) #902344