如果一个正多边形的外角是15°，则这个多边形是 [ ]
A．正十边形
B．正十二边形
C．正二十四边形
D．正二十边形
答案：C
It's very warm. You wear the coat. [ ]
A. must
B. don't have to
C. have to
D. mustn't
以下哪个厂家不是硬盘厂商（）
A.Sony
B.HITACHI
C.Seagate
D.Maxtor
