Foranyinformationsystemtoserveitspurpose,theinformationmustbe()whenitisneeded.
A.integral B.available C.irreplaceable D.confidential正确答案B
Foranyinformationsystemtoserveitspurpose,theinformationmustbe()whenitisneeded.
A.integral B.available C.irreplaceable D.confidential正确答案B