AEI设备对无源标签的最大识别距离为（）米｡
A.2
B.4
C.6
D.8
参考答案：C
Jasper is a great painter. He is ____ Picasso. [ ]
A. the same great as
B. as great painter as
C. as great a painter as
D. such great a painter as
解放后，我国建立的第一家证券交易所成立于 ( )
A．1949年 B．1950年 C．1951年 D．1952年
