A.10% B.0.2% C.2% D.0.1%
A.成反比 B.成正比 C.成對(duì)數(shù)比 D.成幾何級(jí)數(shù)比
A.為分析純 B.為優(yōu)級(jí)純 C.無砷 D.無鉛