![](https://static.youtibao.com/asksite/comm/pc/images/content_title_q.png)
[单选题]
--- __ --- Once a month()
A.How do you go to the library
B.How often do you go to the library
C.When do you go to the library
![](https://static.youtibao.com/asksite/comm/pc/images/content_title_a.png)
B、How often do you go to the library
A.How do you go to the library
B.How often do you go to the library
C.When do you go to the library
B、How often do you go to the library
第4题
A、Y=(MO一MS)/MS*100
B:Y=(MO一MS)/MOkl00
C、Y二MS/MO*100
D、Y=(MS一MO)/MO*100
第9题
A./T2000/server/database/MO
B./T2000/server/script
C./T2000/server/database/dbbackup