局端设备AN5116-02设备单框满配置可以接入（）ONU用户。
A.512个
B.1024个
C.2048个
D.256个
参考答案：B
_________ is known to us all is that the 2008 Olympic Games will take place in Beijing.
A．It
B．What
C．As
D．Which
悬式和伞式水轮发电机比较有什么特点？
