(A)105% (B)110% (C)120% (D)125%
A.15 B.14 C.16 D.20
(A)+5%、-2.5% (B)+2.5%、-5% (C)+5%、-4% (D)+4%、-5%
A.應搪錫 B.應鍍鋅 C.應鍍銀 D.無需處理
(A)3 (B)1/6 (C)1/3 (D)1/2