单项选择题
A.@12.00 B.12.00美元 C.12.00 D.@USD12.00
A.502/1 250/3 B.502/1 250/2 C.502/1 250/1 D.1250
A.0.50/3 B.502/0.50/2 C.0.50/2 D.0.50/1