单项选择题
A.1个月 B.2周 C.1周
A.3-5天 B.1个月 C.1-2周
A.3% B.20% C.50%
A.30% B.2% C.13%
A.千1 B.万6 C.万8
A.Au99.99 B.Am99.95 C.Pt99.99
A.千1 B.千2 C.千3
A.9:00–22:00 B.8:00–22:00 C.9:30–22:00
A.7 B.8 C.9 D.10
A.1g B.10g C.100元