请输入或粘贴题目内容
搜题
拍照、语音搜题，请扫码下载APP
题目内容
（请给出正确答案）
A.Message authentication code
B.Ciphertext authentication code
C.Cyclic redundancy check
D.Electronic digital signature
答案
更多“When block chaining cryptography is used, what type of code is calculated and appended”相关的问题
第1题
A.followed
B.followed
C.confronted
D.compressed
第2题
A) Hot-melt adhesives
B) Loss-of solvent adhesives
C) Anaerobic adhesives
D) Two-part mix adhesives
第3题
Boy:(5)But I can’t find the red block (积木).
Teacher: Let me see.I can tell when I’m getting angry because my face feels hot and my heart beats faster.Did you feel anything like that when you banged the table just now？
Boy: Yes, I think so.
Teacher: (6).What else could you have done if you couldn’t find the block？
Boy: Wmm…(7).Or find something else to play with.
Teacher: That’s great, Tom.
A.It must feel good.
B.Think about it.
C.I’ve looked everywhere.
D.Ask you for help.
第4题
Which of the following might NOT be the functions of firewalls？
A．To stop hackers from stealing your personal information.
B．To disconnect your PC from the Internet when it is being attacked.
C．To keep hidden software in your computers from leaking valuable information.
D．To block hostile cookies and bugs from being planted on your computers.
第5题
第6题
听力原文： There are three types of noise that can block communication. The first, external noise includes those obvious things that make it difficult to hear, as well as many other kinds of distractions. For instance, too much cigarette smoke in a crowded room might make it hard for you to pay attention to another person, and sitting in the rear of an auditorium might make a speaker's remarks unclear. External noise can interrupt communication almost anywhere in our model -- in the sender, channel, message, or receiver.
The second type of noise is physiological. A hearing disorder is probably the most obvious type of physiological barrier, although many more exist. Consider, for instance, the difficulty you experience as a listener when you are suffering from a cold or are very tired. In the same way you might speak less when you have a sore throat or a headache.
Psychological noise refers to forces within the sender or receiver that make these people less able to express or understand the message clearly. For instance, a fisherman might exaggerate the size and number of fish caught in order to convince himself and others of his talents. In the same way, a student might become so upset upon learning that she failed a test that she would be unable to clearly understand where she went wrong.
(30)
A．Three types of noise that can make communication difficult.
B．The meaning of external noise.
C．The effect of cigarette smoke.
D．The reason why you can become speechless.
第7题
Woodblock prints are illustrations made from a carved block of wood and printed on paper. They were first used in Japan in 21_________ to illustrate book. When readers became more and more 22_________ in the illustrations for their artistic value, publishers hired skilled artists to create prints which could be sold separately. By the end of the 23_________ century, techniques were developed to produce many copies of a print from the same woodblock, making this fine art available to the general public.
The most famous Japanese woodblock prints were made during the 1700s and 1800s. The styles were unique to Japan. Scenes from everyday life or the theater, beautiful women, and landscapes were often the 24_________ of these prints. The Japanese name ukiyoe ,25_________ "pictures from the floating world," is used to describe the famous woodblock prints from this era: This refers 26_________ images of fleeting moments of pleasure, amusement, andentertainment 27_________ by the artists. Later, European artists, particularly painters of theFrench Impressionist School, admired and were influenced by the bold colors and 28_________ designs of these Japanese woodblock prints.
Making a woodblock print has three 29_________ stages:cutting, inking and printing. First the artist takes a block of soft wood, usually pine, and cuts away parts of the wood with a sharp too1. The design is the part of the wood that is left uncut and upraised. Next the design is coated with 30_________ , and a sheet of paper is placed over it , rubbing the paper then transfers the ink from the woodblock to the surface of the paper. For different colors, different blocks of wood are used, one for each color.
21.A.1960 B.the 1960 C.1960s D.the 1960s
22.A.interest B.interested C.interesting D.interests
23.A.seventeen B.seventeen's C.seventeenth D.seventeenths
24.A.subjects B.names C.pictures D.paper
25.A.mean B.means C.meant D.meaning
26.A.on B. to C. up D. for
27.A.found B.invented C.captured D.created
28.A.unusual B.usual C.ordinary D.common
29.A.big B.small C.minor D.major
30.A.ink B.paper C.plastic D.wood
第8题
To discourage motorists from leaving their cars in the streets all day, parking meters are used. When you park at a meter, you will pay a coin. This pays for a certain amount of time. The meter re cords this and it shows when the time that you have paid for is finished. If the car is still there then, you have to pay a fine.
Traffic wardens look after the meters. They walk around the streets and check that every meter shows that money has been paid for the car parked there. If a meter registers" time expired", the motorist who has left his car there is fined. Of course, the traffic :warden cannot wait for the owner of car to return. He carries a block of printed forms, and on one of these he writes down all the details, such as the registration number of the car, where it is parked, how much the driver must pay and where he must send the money. He leaves this form. on the car where the driver will be able to see it easily; he usually pushes it under one of the windscreen wipers so that it will not blow away. And in case it rains before the motorist returns, the form. is put in a little plastic envelope to protect it. When the driver comes back, he gets an unpleasant surprise, but it is his own fault for leaving his car too long at a parking meter.
What is "rush hours"？
A．A period when cars are rushing on the roads.
B．A period when people are going to or from their work.
C．A period when cars are crowed on the roads.
D．A period when people are crowed in the buses.
第9题
听力原文： When Iraqi troops blew up hundreds of Kuwaiti oil wells at the end of the Gulf War, scientists feared environmental disaster. Would black powder in the smoke from the fires circle the globe and block out the sun？
Many said "No way. Rain would wash the black powder from the atmosphere. But in America, air sampling balloons have detected high concentrations of particles similar to those that were collected in Kuwait. Some oil didn't catch fire. It has formed huge lakes in the Kuwaiti desert. They trap insects and birds, and poison a variety of other desert animals and plants.
The only good news is that the oil lakes have not affected the underground water resources. So far, the oil has not been absorbed because of the hard sand just below the surface.
Nothing, however, stops the oil from evaporating. The resulting poisonous gases are choking nearby residents. Officials are trying to organize a quick cleanup, but they are not sure how to do it. One possibility is to burn the oil. Get those black-powder detectors ready.
The consequence of the Gulf War that has called the concerns of the scientists is ______.
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the rims.
第10题
M: Good morning, everyone.
W: Robin, can you tell us what the mountain lake cycle tour is all about？
M: Well, Ann, die tour today is not a race. People do it for fitness and fun and try to better their time every year.
W: How long will it take to cycle one way, Robin？
M: About seven to nine hours for the average cyclists. Good cyclists can do it in four hours.
W: How many people will be taking part this year？
M: This is our biggest year ever. We have twelve hundred cyclists registered.
W: I doubt they' 11 block the road when die cyclists start out？
M: Don' t worry, we' ve introduced the staggered starts to avoid these problems. Our fast group will leave Ottawa at seven o' clock.
W: Thank you, Robin. Now down to the starting line of the university.
Where does this interview take place？
A．In the radio studio.
B．In the bicycle shop.
C．On the road.
第11题
Many said" No way？; Rain would wash the black powder from the atmosphere. But in America, air-sampling bal loons have detected high concentrations of particles similar to those collected in Kuwait didn't catch fire. It has formed huge Takes in the Kuwaiti desert. They trap insects and birds ,and poison a variety of other desert animals and plants.
The only good news is that the oil lakes have not affected the underground water resources. So far, the oil has not been absorbed because of the hard sand just below the surface.
Nothing, however, stops the oil from evaporating. The resulting poisonous gases are choking nearby residents.
Officials are trying to organize a quick cleanup, but they are not sure how to do it. One possibility is to burn the oil. Get those black-powder detectors ready.
What were the scientists worried about soon after the Gulf War？
A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black powder from the fires.
