题目内容
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[单选题]
A system using Discretionary Access Control （DAC) is vulnerable to which one of the fo
A.Trojan horse
B.Phreaking
C.Spoofing
D.SYN flood
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
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A.Trojan horse
B.Phreaking
C.Spoofing
D.SYN flood
如果结果不匹配，请 联系老师 获取答案
更多“A system using Discretionary A…”相关的问题
A.The operating system
B.IIS
C.The GINA
D.The SSL Service
A.You have configure your filter incorrectly
B.You are sniffing packets in a switch network
C.Tcpdump captures packets only between your host and another host
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A.Writeline(“a={0},b={1}”,a,b);}}的输出结果是（）
B.a=2,b=1
C.a=1,b=1
D.a=1,b=0
E.a=2,b=2
Back then, the Cherokee had no way to write down words in their ownlanguage.Sequoyah believed it was important for the Cherokee to have a systemof writing.So, in 1809, he set out to create an alphabet that the Cherokeecould use to do just that.
Sequoyah started by drawing pictures, with each one representing adifferent word or idea.He soon realized that writing sentences using pictureswould be much too difficult.There were too many words.No one would ever beable to remember that many pictures.
Sequoyah decided to try a different approach.He began to developsymbols to stand for the sounds, or syllables (音节), that made upwords.Twelve years later, he completed a system of writing with 86 differentsymbols.Each one stood for a different syllable in the Cherokee language.Thesymbols could easily be put together to form. words.Soon thousands of Cherokeewere able to read and write in their own language.
Sequoyah's work did not end there, however.He helped to establish aprint shop and began publishing a bilingual newspaper in both Cherokee andEnglish.The shop also printed books translated from English into Cherokee.Inlater years, Sequoyah also became a political leader among the Cherokee.
21.As can be learned from the firstparagraph, a Cherokee was a().
A.Native Americans
B.writer
C.White man
D.genius
22.“Talking leaves” in the final paragraphrefers to().
A.English spellings
B.pieces of paper with words
C.English sentences
D.tree leaves that make sounds
23.To create an alphabet, Sequoyah beganwith pictures that stand for().
A.sounds
B.symbols
C.words
D.syllables
24.Sequoyah's invention was important tothe Cherokee, because().
A.the Cherokee are now able to read and write
B.the Cherokee now make a living with thewriting system
C.one of their parks was named afterSequoyah
D.the Cherokee are proud of hisachievement
25.Sequoyah is best remembered for().
A.being able to read and write
B.being raised as a Cherokee
C.drawing pictures to represent words orideas
D.inventing a written language for the Cherokee
cancer. originally,because of a lawsuit that alleged such a link Network news programs ran their own tests of cell phones,reporting to the public that some cell phones exceed the maximum level of emitted radio frequency energy allowed by the US Federal Communications Commission.
In 2000.it was estimated that there were 92 million cell phone users in the United States and this number was growing by 1 million every month. More recently,the Cellar Telecommunications & Internet Association estimated that there were almost 170 million US cell phone users, and the seriousness of brain tumours, this is clearly a topic of wide concern.This report summarizes what we now know about the carcinogenicity of using cell phones.
Cell phones operate with radio frequencies.a form. of energy located on the electromagnetic spectrum between F M radio waves and the waves used in microwave ovens,radar;and satellite stations.Cell phones do not emit ionizing radiation,the type that damages DNA and is known to have the ability to cause cancer.
Cell phone technology works on a system of geographically separated zones called "cells" Each cell has its own "base station" that both receives and emits radio waves.When a call is placed from a cell phone,a signal is sent from the cell phone antenna to that cell's base station antenna.The base station responds to the cell phone signal by assigning the phone an available RF channel.When the RF channel is assigned,radio signals are simultaneously received and transmitted, allowing voice information to be carried between the cell phone and the base.The base station transfers the call to a switching centre.where the call can be transferred to a local telephone carrier or another cell phone.
6.There has existed argument about the link between cell phone and brain tumour.()
7.The rapid growing number of cell phone users has been a great concern in the US.()
8.The 3rd paragraph tries to prove that cell phones do not cause brain cancer.()
9.A switching centre is needed when we make a call through cell phone.()
10.The topic of the passage is about cell phone and cancer.()
“Rest, relaxation, and stress reduction are very important for people’s wellbeing and health. This can be accomplished through daily activities, such as exercise and meditation, but vacation is an important part of this as well, ” said primary care physician Natasha Withers from One Medical Group in New York. Withers lists a decreased risk of heart disease and improved reaction time as some of the benefits from taking some time off.“We also know that the mind is very powerful and can help with healing，so a rested，relaxed mind is able to help the body heal better, ” said Withers.
Psychologists confirm the value of vacations for the mind.“The impact that taking a vacation has on one’s mental health is great, ” said Francine Lederer, a clinical psychologist in Los Angeles who specializes in stress and relationship management.“Most people have better life perspective and are more motivated to achieve their goals after a vacation，even if it is a 24hour timeout.” The trips could be good for their health, good for their family and good for their businesses.
The online travel agency Expedia conducted a survey about vacation time in 2010, and according to their data the average American earned 18 vacation days—but only used 14 of them. France topped the list, with the average worker earning 37 vacation days and using all but two of them. Americans’ responses may not be surprising in a culture where long hours on the job often are valued, but that’s not always good for the individual, the family or the employer.
Psychologists have also found that people who don’t take enough time to relax may find it harder to relax in the future.“Without time and opportunity to do this，the nerve connections that produce feelings of calm and peacefulness become weaker, making it actually more difficult to shift into lessstressed states, ” Mulhern said.
阅读B-16题干中Passage One材料，完成本题。
B-17.According to Natasha Withers，vacations can________.
A、weaken reaction system
B、cure serious diseases
C、reduce the level of wellbeing
D、decrease the risk of heart disease
阅读B-16题干中Passage One材料，完成本题。
B-20.What is mainly talked about in the text？
A、Ways to relax in one’s free time.
B、The benefits of taking time off.
C、Different opinions on holidays.
D、The Hostetlers always on the go.
A.making tools
B.using leaves as gloves
C.using zebra crossings
D.cracking open nuts
A.direction
B.operation
C.organization
D.assistance
Which of the following can be tracked using the WBS？
A.time
B.cost
C.performance
D.scope
E.None of the above.
Using a file without a handle may result in().
A.your work becoming rounded
B.injury to your hand
C.overheating of the file
D.pinning
