Linux操作系统
Linux操作系统
The second part of the Internet is the" pipes" that carry data, video, e-mail messages, and text from companies such as Google, Hulu, Yahoo !, and Twitter, the millions of websites that make up Internet content and services, to customers. Some of these" pipe" providers, specifically telecom and cable companies, are already complaining that the amount of data that they have to move is rising too rapidly for them to accommodate. Video files, which are particularly large, have posed significant problems to cable companies and they have asked Washington to be able to charge more for customers who use the Internet to transfer large files. So far, the government has turned those requests down.
All the following are mentioned as part of the "pipes" EXCEPT
A:e-mail messages. B:video. C:text from companies. D:cable companies.
{{B}}第三篇{{/B}}
| ? ? ? ? ? ? ?
? ? ? ? ? {{B}}Electronic Mail{{/B}} ? ?During the past few years, scientist the world over have suddenly found themselves productively engaged in task they once spent their lives avoiding — writing, any kind of writing but particularly letter writing. Encouraged by electronic mail’s surprisingly high speed, convenience and economy, people who never before touched the stuff are regularly, skillfully, even cheerfully tapping out a great deal of correspondence. ? ?Electronic networks, woven into the fabric of scientific communication these days, are the route to colleagues in distant counties, shared data, bulletin boards and electronic journals. Anyone with a personal computer, a modem.and the software to link computers over telephone lines can sign on. An estimated five million scientists have done so with more joining every day, most of them communicating through a bundle of interconnected domestic and foreign routes known collectively as the internet, or net. ? ?E-mail is staring to edge out the fax, the telephone, overnight mail, and of course, land mail. It shrinks time and distance between scientific collaborators, in part because it is conveniently asynchronous (writers can type while their colleagues across time zones sleep; their message will be waiting). If it is not yet speeding discoveries, it is certainly accelerating communication. ? ?Jeremy Bemstei, the physicist and science writer, once called E-mail the physicist’s umbilical cord. Lately other people, too, have been discovering its connective virtues. Physicists are using it; college students are using it, everybody is using it, and as a sign that it has come of age, the New Yorker has accelerates its liberating presence with a cartoon — an appreciative dog seated at a keyboard, saying happily, "On the Intemet, nobody knows you’re a dog." |
A:Their functions cannot be replaced by E-mail. B:They will co-exist with E-mail for a long time. C:Less and less people will use them. D:They will play a supplementary function to E-mail.
{{B}}第二篇{{/B}}
| {{B}}? ? ? ? ? ? ?
? ? ? ? ? ? ? ? ? ? ?
? ? Electronic Mail{{/B}} ? ?During the past few years, scientist the world over have suddenly found themselves productively engaged in task they once spent their lives avoiding-writing, any kind of writing but particularly letter writing. Encouraged by electronic mail’s surprisingly high speed, convenience and economy, people who never before touched the stuff are regularly, skillfully, even cheerfully tapping out a great deal of correspondence. ? ?Electronic networks, woven into the fabric of scientific communication these days, are the route to colleagues in distant counties, shared data, bulletin boards and electronic journals. Anyone with a personal computer, a modem and the software to link computers over telephone lines can sign on. An estimated five million scientists have done so with more joining every day, most of them communicating through a bundle of interconnected domestic and foreign routes known collectively as the internet, or net. ? ? E-mail is staring to edge out the fax, the telephone, overnight mail, and of course, land mail. It shrinks time and distance between scientific collaborators, in par[ because it is conveniently asynchronous (writers can type while their colleagues across time zones sleep; their message will be waiting). If it is not yet speeding discoveries, it is certainly accelerating communication. ? ?Jeremy Bernstei, the physicist and science writer, once called E-mail the physicist’s umbilical cord. Lately other people, too, have been discovering its connective virtues. Physicists are using it; college students are using it, everybody is using it, and as a sign that it has come of age, the New Yorker has accelerates its liberating presence with a cartoon--an appreciative dog seated at a keyboard, saying happily, "On the Internet, nobody knows you’re a dog." |
A:Their functions cannot be replaced by E-mail. B:They will co-exist with E-mail for a long time. C:Less and less people will use them. D:They will play a supplementary function to E-mail.
若要对Data类中重载的加法运算符成员函数进行声明，下列选项中正确的是______。
A:Data+(Data); B:Data operator+(Data); C:Data+operator(Data); D:operator+(Data,Data);
设有如下定义：
struct sk
int a；float b；data，* p；
若有p＝& data；，则对data中的a域的正确引用是 ( )
A:(* p)．data B:(* p)．a C:p-＞data D:data． a
已知有结构体： struct sk { iht a; float b; )data,*p; 若有p=&data，则对data的成员a的正确引用是( )。
A:(*.data B:(*.a; C:p-＞data D:data
已知有结构体： struct sk { int a； float b； }data,*p； 若有p=&data，则对data的成员a的正确引用是( )。
A:(* .data B:(* .a； C:p-＞data D:data
若要对Data类中重载的加法运算符成员函数进行声明，下列选项中正确的是
A:Data+(Data); B:Data operator+(Data); C:Data+operator(Data); D:operator+(Data,Data);
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