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【单选题】
()就是采用数学方法对原始信息(通常称为“明文”)进行再组织,使得加密后在网络上公开传输的内容对于非法接收者来说成为无意义的文字(加密后的信息通常称为“密文”)。
A.
信息加密技术
B.
硬件隔离
C.
病毒清除组件
D.
服务访问政策
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【单选题】长期中,对企业来说下列成本中哪一项是不存在的( )
A.
固定成本
B.
机会成本
C.
可变成本
D.
隐性成本(不要求企业支出货币的投入成本)
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【单选题】A friend of mine, after 10 years of studying ballet, succeeded ________ becoming a dancer.
A.
in
B.
on
C.
with
D.
of
【简答题】A.Almost 10 years. B.A few years. C.A couple of months. D.Three days after the wedding.
【简答题】计算下列表达式 "123" + "314"
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