单项选择题
A.3% B.0.3% C.0.3/1 D.3‰
A.SCZU7854343/20 B.SCZU7854343/20/自重 C.SCZU7855234/40/自重 D.SCZU7855234/40
A.3% B.3‰ C.3/1 D.502/3/1