()即攻击者利用网络窃取工具经由网络传输的数据包,通过分析获得重要的信息。
A、身份假冒
B、数据篡改
C、信息窃取
D、越权访问
参考答案:C
已知数列的通项公式是an=2n-49,则前n项的和Sn达到最小值时,n为().
A.23
B.24
C.25
D.26
— How long do you think it will be _____ the Stock Market returns to normal?
— At least one year, I guess. [ ]
A. when
B. before
C. until
D. that