与十进制数1023等值的十六进制数为
A．3FDH
B．3FFH
C．2DH
D．3EFH
参考答案：B
解析： 十进制转成十六进制的方法是“除十六取余”。
Don't make so much noise. The students _____ an English class. [ ]
A. are having
B. have
C. had
D. were having
影子汇率换算系数是影子汇率与国家外汇牌价的比值，由国家统一测定和发布。目前我国的影子汇率换算系数值为( )。
A．1
B．1.05
C．1.08
D．1.15
