水准面有无数个，而大地水准面只有一个。
参考答案：对
Johann Strauss, as a composer, was _____ more successful and popular than his father. [ ]
A. very
B. so
C. even
D. too
在下列多媒体数据文件中，( )是Microsoft开发的可以直接在网上观看视频节目的文件压缩格式。
A．AVI
B．MP3
C．ASF
D．MOV
