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【单选题】
对访问控制模型的解释以下哪一项是正确的？（）A.
访问控制模型是用于进行主体身份认证的模型。
B.
当用户提交访问请求后，访问监控器负责接收用户请求，并将其与负责访问控制策略或规则进行对比，只有符合安全策略的请求才能够实现对资源的访问。
C.
当用户提交访问请求后，访问监控器负责接收用户请求并可以直接判断请求是否符合安全策略，从而接收或者拒绝用户对资源的访问。
D.
当用户提交访问请求后，控制规则库负责接收用户请求，并与规则库中的规则进行对比，只有符合安全策略的请求才能够实现对资源的访问。
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举一反三
【单选题】对 X 线的描述,下列正确的是
A.
X 线的硬度大，频率高，穿透力弱
B.
X 线的硬度大， HVL 小，穿透力强
C.
X 线的硬度大，频率高，穿透力强
D.
X 线的硬度大，波长长，穿透力弱
【简答题】将知识点写作业本上: 1. who had arrested him three times for carrying drugs. A . Before George stood the policeman B . Before George the policeman stood C . Before the policeman stood George D . Before George...
【单选题】对X线的描述,下列正确的是
A.
X线的硬度大——波长长——穿透力强
B.
X线的硬度大——频率高——穿透力弱
C.
X线的硬度大——波长长——穿透力弱
D.
X线的硬度大——HVL小——穿透力强
E.
X线的硬度大一频率高一穿透力强
【单选题】The policeman supposed .
A.
whether the victim had rung the doorbell
B.
he would come to get the money in the rubbish bin.
C.
when did the witness see the murder
D.
that how the man ran out of the dark house
【简答题】A policeman was sitting in his car on the side of Highway 25, hoping to catch speeders . After a while , a car full of elderly women slowly rolled by. The policeman realized that the slow—moving car ...
【单选题】. They told the policeman the fact they had nothing to do with the murder.
A.
that
B.
which
C.
why
D.
how
【单选题】Words failed her when the _____ mother wanted to express her thanks to the policeman who had saved her son. [ ]
A.
upset
B.
grateful
C.
confident
D.
sensitive
【单选题】根据《生产过程危险和有害因素分类与代码》(GB/T 13861—1992)的规定，下列不属于化学性危险和有害因素的是( )。
A.
易燃易爆性物质
B.
腐蚀性物质
C.
有毒物质
D.
电磁辐射
【简答题】The taxi driver had to ________ to the side of the road when a policeman began to follow him for speeding.
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