The following statements about educational background are correct EXCEPT（）
A. Educational background is about the levels of education you have received
B. Schools should be listed according to importance degree
C. The most recent educational information is usually put first
D. Educational background is usually put from the higher educational level to the lower
服务器虚拟化的理解（）
A. 将一个或多个物理服务器虚拟成多个逻辑上的服务器，集中管理，能跨越物理平台不受限制
B. 一种是把一个物理的服务器虚拟成若干个独立的逻辑服务器，比如分区
C. 一种是把若干分散的物理服务器虚拟为一个大的逻辑服务器，比如网格技术
D. VMware Workstation Pro 就是虚拟技术应用
下面几个语句中属于授权的语句是（）
A. grant select on .to[email protected]’localhost’
B. revoke all on .from[email protected]’localhost’
C. create user[email protected]’localhost’
D. flush privileges;
有表 song（id,song_name,album,play_count,fav_count）分别表示歌曲的主键id、歌曲名、专辑名、播放次数和收藏次数，以下与order by相关的sql错误的是（）
A. select * from song order by play_count asc;
B. select * from song order by （play_count + fav_count） asc;
C. select * from song order by fav_count desc where play_count ＞ 5;
D. select * from song order by id,play_count asc,fav_count desc;
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