（) the windows is your task.

You have a file server named Server1 that runs Windows Server 2003 Service Pack 2 (SP2).You need to use Windows Backup to meet the following requirements:·Minimize the number of scheduled backup jobs.·Perform a scheduled normal backup to disk every Friday.·Perform a scheduled normal backup to tape every Friday.·Perform scheduled differential backups to tape every Monday, Tuesday, Wednesday, and Thursday.How many scheduled jobs should you create from Windows Backup？ （）

A.one

B.two

C.three

D.six

A.YO/Y-12

B.Y/Yo-12

C.Yo/A一11

D.△/Yo-11

E.△/Yo—12

A.Δ/Δ

B.Yo/Yo

C.Yo/Δ

D.Δ/Yo

A.as

B.if

C.while

D.that

设f(x，y)与ψ(x，y)均为可微函数，且ψˊy(x，y)≠0，已知(xo，yo)是f(x，y)在约束条件ψ(x，y)＝0下的一个极值点，下列选项正确的是()

A．若fˊx(xo，yo)＝0则fˊy(xo，yo)＝0

B．若fˊx(xo，yo)＝0则fˊy(xo，yo)＝0

C．若fˊx(xo，yo)≠0则fˊy(xo，yo)≠0

D．若fˊx(xo，yo)≠0则fˊy(xo，yo)≠0

A.puedo

B.pueda

C.podré

D.podrá