【简答题】提高切削速度、增大进给量和背吃刀量,都能提高金属切除率,其中影响耐用度最大的是 ;影响最小的是 。
【简答题】A.David has little interest in music. B.He has not played the violin for a long time. C.David has met Miss Hanson before. D.He is a very good violin player.
【单选题】She would like ____ a violin lesson.
【单选题】—What ________ she have? —She has a violin.
【简答题】从优秀国产影片中根据动势剪辑完成30S作品。
【单选题】What is the main idea presented in paragraph 3?
A.
The violin has been modified to fit its evolving musical functions.
B.
The violin is probably the best known and most widely distributed musical instrument in the world.
C.
The violin had reached the height of its popularity by the middle of the eighteenth century.
D.
The technique of playing the violin has remained essentially the same since the 1600's.