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What can be concluded about "modem" ?
A．It converts data from one form. to another.
B．It will be out of date soon.
C．It serves as a link between senders and recipients of message.
D．It transmits message more efficiently than other devices.
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更多 “ What can be concluded about "modem" ?A．It converts data from one form. to another.B．It will be out of date soon.C．It serves as a link between senders and recipients of message.D．It transmits message more efficiently than other devices. ” 相关考题
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An activity has an early start date-of the lOth and a late start date of the 19th. The activity also has a duration of 4 days. There are no nonworkdays. From the information given, （）what can be concluded about the activity?A.Total float for the activity is 9 days.B.The early finish date ofthe activity is the end ofthe day on the 14th.C.The late finish date is the 25th.D.The activity can be completed in 2 days ifthe resources devoted to it are doubled.
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What do we know about Olivetti ?A.It produced the best typewriter in the word.B.It designed the word’s first mainframe. computer.C.It exported more typewriter than other computer.D.It has five independent companies with its head office in lvrea.
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What can be inferred from Paragraph 4?A. Unpackaged products are of bad quality.B. Supermarkets care more about packaging.C. It is improper to judge quality by packaging.D. Other products are better packaged than food.
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What information can parents probably get about their children at family dinner? (no more than 12 words)_________________________________________________________________
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One can never find out what the other people think about from his facial expression.
A、It means "wearing the mask"B、It means "keeping ideas to herself"C、It means "telling everyone her bright ideas"D、It means "agreeing with others’ ideas"
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Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept(67), examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have(68)network layer, the router may be able to translate between the packet formats. In the transport layer we fmd transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message(69). As an example, gateways between Internet e-mail and X.400 e-mail must(70)the e-mail message and change various header fields.A．repeatersB．relaysC．connectorsD．modems
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Digital data can also be represented by (71)signals by use ofa modem. The modem converts a series of binary voltage (72) into an analog signal by encoding the digital data ontoa carrier frequency. The resulting signal occupies a certam spectrum of (73) centered about the carTier and may be propagated acrossa medium suitable for that carrier. The most common modems represent digital data in the voice(74)and hence allow those datato be propagated over ordinary voice-grade (75 )lines At the other end of the line, another modem demodulates the signal to recover the original data(71)A.analogB.digitalC.ModemD.electric
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What is the difference between a CSU／DSU and a modem?()
A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
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What can be concluded from the passage?A. A fuelling ambition plays a leading role in one’s success.B. A responsible adviser is more important than the knowledge of writing.C. As to the growth of a genius, I.Q. doesn’t matter, but just his/her efforts.D. What really matters is what you do rather than who you are.
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（71）is the science of hiding information。Whereas the goal of cryptography is to make data unreadable by a third party。the goal of steganography is to hide the data from a third party。In this article,I will discuss what steganography is,what purposes it serves,and will provide an example using available software。
There are a large number of steganographic（2）that most of us are familiar with(especially if you watch a lot of spy movies),ranging from invisible ink and microdots to secreting a hidden message in the second letter of each word of a large body of text and spread spectrum radio communication。With computers and networks,there are many other ways of hiding informations,such as:
Covert channels(c,g,Loki and some distributed denial-of-service tools use the Internet Control（3）Protocol,or ICMP,as the communication channel between the“bad guy”and a compromicyed system)
Hidden text within Web pages
Hiding files in“plain sight”(c,g，what better place to“hide”a file than with an important sounding name in the c:\winnt system32 directory)
Null ciphers(c,g,using the first letter of each word to form a hidden message in an otherwise innocuous text)
steganography today,however,is significantly more（4）than the example about suggest,allowing a user to hide large amounts of information within image and audio。These forms of steganography often are used in conjunction with cryptography so the information is double protected;first it is encrypted and then hidden so that an advertisement first。find the information(an often difficult task in and of itself)and the decrypted it。
The simplest approach to hiding data within an image file is called（5）signature insertion。In this method ,we can take the binary representation of the hidden data and the bit of each byte within the covert image。If we are using 24-bit color the amount and will be minimum and indiscriminate to the human eye。
（73）处的单词应是 A.Member
B.Management
C.Message
D.Mail
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What can be inferred from paragraph 1 about theatrical dance in the late nineteenth century？( ) A.It influenced many artists outside of the field of dance.
B.It was very similar to theatrical dance of the early nineteenth century.
C.It was more a form of entertainment than a form of serious art.
D.It was a relatively new art form in the United States.
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What is the difference between a CSU/DSU and a modem?（）A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineB、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
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HSRP has been configured between two Company devices. What kind of message does an HSRP configured router send out every 3 seconds？（）A、 RetireB、 CoupC、 ResignD、 SendE、 Hello
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You are subneting in the network， out of network address，what’s feature can add one more address？
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In which case would you use a FULL OUTER JOIN?（）A、Both tables have NULL values.B、You want all unmatched data from one table.C、You want all matched data from both tables.D、You want all unmatched data from both tables.E、One of the tables has more data than the other.F、You want all matched and unmatched data from only one table.
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Which three statements about subqueries are true? （）A、A main query can have more than one subquery.B、A subquery can have more than one main query.C、The subquery and main query must retrieve data from the same table.D、The subquery and main query can retrieve data from different tables.E、Only one column or expression can be compared between the subquery and main query.F、Multiple columns or expression can be compared between the subquery and main query.
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Which two statements about subqueries are true?（）A、A single row subquery can retrieve data from only one table.B、A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.C、A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.D、A single row subquery can retrieve data from more than one table.E、A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.F、A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.
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Which two statements are true about simple views？（）A、Views can be created as read only.B、Views are data segments like tables.C、Views can be created on the basis of more than one table.D、Data manipulation language （DML） operations cannot be performed on views.
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单选题We can learn from the Kimberly case that _____.A
children are more than just personal possessions of their parentsB
the biological link between parent and child should be emphasizedC
foster homes bring children more pain and suffering than careD
biological parents shouldn’t claim custody fights after their child is adopted
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单选题In which case would you use a FULL OUTER JOIN?（）A
Both tables have NULL values.B
You want all unmatched data from one table.C
You want all matched data from both tables.D
You want all unmatched data from both tables.E
One of the tables has more data than the other.F
You want all matched and unmatched data from only one table.
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单选题What can NOT be concluded from the passage?A
More and more young people are volunteering to carry out suicide bombings since the conflict according to militant groups’ data.B
Israel’s intensified blockade has brought Gaza a darker sky.C
All the Palestinian militant groups are united against Israel.D
Young Palestinian men are feeling depressed but sense a hopeful future.
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单选题HSRP has been configured between two Company devices. What kind of message does an HSRP configured router send out every 3 seconds？（）A
RetireB
CoupC
ResignD
SendE
Hello
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多选题Which three statements about subqueries are true? （）AA main query can have more than one subquery.BA subquery can have more than one main query.CThe subquery and main query must retrieve data from the same table.DThe subquery and main query can retrieve data from different tables.EOnly one column or expression can be compared between the subquery and main query.FMultiple columns or expression can be compared between the subquery and main query.
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多选题Which two statements about subqueries are true? （）AA single row subquery can retrieve data from only one table.BA SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.CA SQL query statement can display data from table B that is referred to in its subquery, without including B in its own FROM clause.DA single row subquery can retrieve data from more than one table.EA single row subquery cannot be used in a condition where the LIKE operator is used for comparison.FA multiple-row subquery cannot be used in an INSERT statement to insert multiple rows at a time.
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单选题What is the difference between a CSU/DSU and a modem?（）A
A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D
A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
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单选题What is the difference between a CSU/DSU and a modem?（）A
A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineB
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD
A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
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单选题It may be concluded from this passage that _____.A
Islamic artists have had to create architectural decoration with images of flowers or geometric formsB
history teachers are more objective than artistsC
it is more difficult to study art history than general historyD
people and stories from the Bible were painted on churches and other Buildings in order to popularize the Bible
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