单项选择题
A.小于5.5 B.小于等于5.5 C.小于6 D.小于等于6
A.大于12000 B.大于等于12000 C.大于15000 D.大于等于15000
A.大于等于3500 B.大于4500 C.大于等于4500 D.大于等于5000