皮皮学,免费搜题
登录
搜题
【单选题】
Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an(71)from a friend who asks you to open it. This is what happens with Melissa and several other similar email(72). Upon running, such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages(73)As administrators seek to block dangerous email attachments through the recognition of well-known(74), virus writers use other extensions to circumvent such protection. Executable(.exe)files are renamed to .bat and .cmd plus a whole list of other extensions and will still nm and successfully infect target users.Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the(75)access to your network.
A.
attachment
B.
packet
C.
datagram
D.
message
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【单选题】若某关系R(A, B, C, D)有函数依赖AB→C, C→D, C→A,该关系所满足的最高范式是
A.
1NF
B.
2NF
C.
3NF
D.
BCNF
【单选题】若r<r α 时,则在α水准上可认为相应的两变量X,Y间______。
A.
不存在任何关系
B.
有直线相关关系
C.
有确定的函数关系
D.
不存在直线关系,但不排除存在某种曲线关系
【简答题】在一般情况下,旅游调节应坚持两条原则:尽量调节原则和____原则。
【单选题】陶瓷的最大缺点是()
A.
硬度高
B.
强度高
C.
塑性低
D.
脆性
【简答题】一般情况下,两条平行线之间的最小间隙不得小于 mm [填空(1)]A. 0.7
【单选题】若某关系R(A, B, C, D)有函数依赖AB→C, C→D, D→A,那么下面属性集( )不是关系R的候选码。
A.
{A,B}
B.
{B,C}
C.
{B,D}
D.
{A,C}
【判断题】风险回避的主要原则是主观和客观风险并存的情况下以回避主观风险为主。()
A.
正确
B.
错误
【单选题】根据所学,分析陶瓷在应用中最大的缺点是( )。
A.
脆性大
B.
硬度高
C.
熔点高
D.
韧性大
【单选题】具有两条流水线的CPU,一般情况下每个时钟周期可以执行______。
A.
一条指令
B.
两条指令
C.
三条指令
D.
四条指令
【单选题】若某关系 R的属性集A函数决定R中所有其它属性,则 A 为关系 R的一个
A.
B.
主键
C.
超键
D.
外键
相关题目: