信息系统的安全威胁分成七类，其中不包括()
A、自然事件风险和人为事件风险D
暂无解析
Hebecameasuccessfulactor________hisfatherneverwas.
Thetwinsisterswereidentical________appearanceandcharacter.
is,are,has,have,havingTheaverageBritishfamily,which________smallerandricherthan50yearsago,________3.6members.
Thesyntacticrulesofanylanguageare______innumber.
Theengineer______myfatherworksisabout50yearsold.
