下列属于碱的一组物质是 [ ]
A．Ba(OH)2、CaO
B．CuSO4、Cu(OH)2
C．H2SO4、HCl
D．Fe(OH)2、KOH
答案：D
Most Brazilians get along well with each other, _________ they are from different races(种族), including Americans, European settlers, and Africans,.
A．although
B．as a result
C．since
D．unless
华为CDMABSS系统可以支持以下硬切换：Ec/Io触发的同频硬切换、异频搜索硬切换、（）和（）联合触发的异频硬切换。
