在MPEG 系列标准中， ( ) 不属于音、视频压缩编码技术标准。
A．MPEG-1
B．MPEG-2
C．MPEG-4
D．MPEG-7
参考答案：D
___I saw him, his humor impressed me.
A．The first time
B．At first
C．It was the first time
D．For the first time
弱性树脂有什么特性？
