列举20世纪70年代初,我国外交工作取得的三大成就。
1971年中国在联合国的合法席位得以恢复;1972年美国总统尼克松访问中国;1972年日本内阁大臣田中角荣访问中国,中日建交。
When most people refer to multimedia, they generally mean the combination of two or more continuous media, usually with some user (115) . In practice, the two media are normally audio and video, this is, (116) plus moving (117) .
It should be’ obvious by now that transmitting multimedia material in uncompressed form is completely out of (118) . The only hope is that massive compression is possible. Fortunately, a large body of research over the past few decades has led to many compression techniques and algorithms that make multimedia transmission (119) .
(117)是()
A.display
B.games
C.help
D.interaction
E.pictures
F.sound
G.web
低碳也可促进经济