已知x有两个平方根,且│x│=3,则x的值为 [ ]
A、9
B、3
C、-3
D、±3
答案:B
Each girl present at the party was wearing a flower in the hair, which__________their beauty.
A.added
B.added up
C.added to
D.added up to
完成基本呼叫所需的媒体资源由哪个设备进行播放控制?()
A.Application Server
B.Media Server
C.Softswitch
D.MG