皮皮学，免费搜题
登录
搜题
【简答题】
●安全的威胁可分为两大类，即主动攻击和被动攻击。通过截取以前的合法记录稍后重新加入一个连接，叫做重放攻击。为防止这种情况，可以采用的办法是 (50) 。一个计算机系统被认为是可信任的，主要从其受保护的程度而言的，Windows NT 4．0 以上版本目前具有的安全等级是 (51) 。 (50) A．加入时间戳 B．加密 C．认证 D．使用密钥 (51) A．D级 B．C1级 C．C2级 D．B级
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】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Mary, left go to a movie. You've been working on these bills for ho...
A.
Have his hair cut.
B.
Go to the cinema.
C.
Go to work.
查看完整题目与答案
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Mary, let's go to a movie. You've been working on these bills for h...
A.
Have his hair cut.
B.
Go to the cinema.
C.
Go to work.
查看完整题目与答案
【简答题】听下面一材料，回答1-3题。 1. What is the man now? A. A dancer. B. A teacher. C. We don't know. 2.Why did the man leave his position? A. He didn't like the work. B. He didn't get along with his boss. C. He wanted...
查看完整题目与答案
【判断题】在法语中，表示时间概念的形容词都是后置形容词。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】A( ) is a computer commtuucation network in a local area, which connects various computers.
A.
Intemet
B.
MAN
C.
WAN
D.
LAN
查看完整题目与答案
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Mary, let's go to a movie. You've been working on these bills for h...
A.
Have his hair cut.
B.
Go to the cinema.
C.
Go to work.
查看完整题目与答案
【单选题】●A local area network(LAN)is the communication of a number of computers by (66) connecting to each one in a single location,usually a single floor of a building or all the computers in a small company...
A.
line
B.
cable
C.
copper
D.
copper cash
查看完整题目与答案
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Jenny, let's go to a movie. You've been working on these bills for ...
A.
He doesn't know how to save money．
B.
He is forgetful．
C.
He is ugly．
查看完整题目与答案
【单选题】A local-area network(LAN)is a communications network that(125)a variety of devices and provides a(126)for information exchange among those devices. The scope of the LAN is small typically a single bui...
A.
broadcast
B.
cable
C.
control
D.
interconnects
E.
internet
查看完整题目与答案
【多选题】Why we can't leave chopsticks sticking up in the rice in China?
A.
Chinese people do this only when they burn incense to sacrifice the dead.
B.
it would be considered you are cursing those who are eating with you.
C.
Place them horizontally over your bowl or plate.
D.
Yes, we can.
查看完整题目与答案
相关题目：
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Mary, left go to a movie. You've been working on these bills for ho...
A.
Have his hair cut.
B.
Go to the cinema.
C.
Go to work.
查看完整题目与答案
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Mary, let's go to a movie. You've been working on these bills for h...
A.
Have his hair cut.
B.
Go to the cinema.
C.
Go to work.
查看完整题目与答案
【简答题】听下面一材料，回答1-3题。 1. What is the man now? A. A dancer. B. A teacher. C. We don't know. 2.Why did the man leave his position? A. He didn't like the work. B. He didn't get along with his boss. C. He wanted...
查看完整题目与答案
【判断题】在法语中，表示时间概念的形容词都是后置形容词。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】A( ) is a computer commtuucation network in a local area, which connects various computers.
A.
Intemet
B.
MAN
C.
WAN
D.
LAN
查看完整题目与答案
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Mary, let's go to a movie. You've been working on these bills for h...
A.
Have his hair cut.
B.
Go to the cinema.
C.
Go to work.
查看完整题目与答案
【单选题】●A local area network(LAN)is the communication of a number of computers by (66) connecting to each one in a single location,usually a single floor of a building or all the computers in a small company...
A.
line
B.
cable
C.
copper
D.
copper cash
查看完整题目与答案
【单选题】第二节 听下面5段对话或独白。每段对话或独白后有几道小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。 听力原文：M: Hey, Jenny, let's go to a movie. You've been working on these bills for ...
A.
He doesn't know how to save money．
B.
He is forgetful．
C.
He is ugly．
查看完整题目与答案
【单选题】A local-area network(LAN)is a communications network that(125)a variety of devices and provides a(126)for information exchange among those devices. The scope of the LAN is small typically a single bui...
A.
broadcast
B.
cable
C.
control
D.
interconnects
E.
internet
查看完整题目与答案
【多选题】Why we can't leave chopsticks sticking up in the rice in China?
A.
Chinese people do this only when they burn incense to sacrifice the dead.
B.
it would be considered you are cursing those who are eating with you.
C.
Place them horizontally over your bowl or plate.
D.
Yes, we can.
查看完整题目与答案