题目详情:

[单项选择]
In the open systems interconnection (OSI) reference model, "layer" means one of seven conceptually complete, (71) arranged groups of services, functions, and protocols, that extend across all open systems.
Application layer provides means for the application (72) to access the OSI environment. Presentation layer provides for the selection of a common syntax for representing data. (73) layer provides the means necessary for cooperating presentation entities to organize and synchronize their dialog and to manage their data exchange. Transport layer provides a reliable end-to-end data transfer service. Network layer provides for the entities in the transport layer the means for transferring blocks of data, by (74) and switching through the network between the open systems in which those entities reside. Data link layer provides services to transfer data between network layer entities. Physical layer provides the mechanical, electr
A. Conversation
B. Dialog
C. Session
D. Discussion

热门试题:

[单选题]消防救援队伍的灭火与应急救援组织指挥通常分为( )层次。
A.四个;
B.五个;
C.二个;
D.三个二个

[填空题]因特网中主机域名需要转换成IP地址，这个过程被称之为【12】。

[不定项选择题]共用题干 The Case of the Disappearing Fingerprints
One useful anti-cancer drug can effectively erase the whorls and other characteristic marks that give people their distinctive fingerprints. Losing______(51)could become troublesome. A case released online in a letter by Annals of Oncology indicates how big a______(52)of losing fingerprints is.
Eng-Huat Tan,a Singapore-based medical doctor describes a 62-year old man who has used capecitabine to______(53)his nasopharyngeal cancer. After three years on the______(54),the patient decided to visit U.S. relatives last December. But he was stopped by U.S. customs officials______(55)4 hours after entering the country when those officials couldn't get fingerprints from the man.There were no distinctive swirly______(56)appearing from his in-dex finger.
U.S.customs has been fingerprinting incoming foreign visitors for years,Tan says.Their in-dex fingers are______(57)and screened against digital files of the fingerprints of bad guys-terrorists and potential criminals that our federal guardians have been tasked with keeping mit of the country. Unfortunately,for the Singaporean travelers,one potential______(58)effect of his drug treatment is a smoothing of the tissue on the finger pads.______(59),no finger- pnnts.
"It is uncertain when fingerprint loss will______(60)to take place in patients who are taking capecitabine,"Tan points out. So he cautions any physicians who______(61)the drug to provide their patients with a doctor's note pointing out that their medicine may cause fingerprints to disappear.
Eventually,the Singapore traveler made it into the United States.I guess the name on his passport didn't raise any red flags.But he's also now got the explanatory doctor's note-and won't leave home______(62)it.
By the way,maybe the Food and Drug Administration,______(63)approved use of the drug 11 years ago,should consider______(64)its list of side effects associated with this medi-cine.The current list does note that patients may experience vomiting,stomach pain and some other side effects.But no where______(65)it mention the potential for loss of fingerprints. 58._________
A.normal
B.good
C.main
D.side