可视电话可以支持的视频协议标准有()
A.H.264
B.H.263+
C.H.261
D.H.262
参考答案:B
______ occurred to her that she should go home to see her old mother. [ ]
A. It
B. One
C. This
D. That
啤酒花果穗为供制啤酒的甜味剂、香味剂、防腐剂。