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;
Which are the special requirements for mechanical design in a mechatronic system()
A. high precision
B. small size
C. large rigidity
D. small moment of inertia
When taking interrogation and examination task, police officers should wear uniform. If not in uniform, police officers should show the()
A. identity cards
B. service cards
C. driving licenses
D. vehicle licenses