相关题目
237、media format
236、storage density
235、For the purpose of transferring messages among individual users of the Internet ( ), each local authority designates a particular machine within its domain to handle the domain＇s email activities.This machine is known as the domain＇s mail server.Every e-mail message sent from within the domain is first sent to the domain＇s mail server, which then sends the message on to its destination.Likewise, every e-mail message addressed to a person within the domain is received by the domain＇ s mail server, where it is held until that person requests to see his or her incoming mail.With the role of a domain＇s mail server in mind, it is easy to understand the structure of an individual＇s e-mail address.It consists of a symbol string identifying the person, followed by the symbol @, and followed by the mnemonic name of the mail server that should receive the mail.Thus, the e-mail address of an individual at Addison Wesley Inc.might appear as Shakespeare @ mailroom.aw.com.In other words, the machine known as mailroom within the domain aw.com is the mail server that handles e-mail for the person Shakespeare.It is common practice for a domain to be designed so that the name of the mail server does not have to appear in the e-mail address.In these cases, e-mail addresses consist of merely a symbol string identifying the e-mail recipient, followed by the symbol @, and followed by the mnemonic domain name.Thus, the address above would be reduced to Shakespeare@ aw.com.(5)、Why we need to designates a particular machine as mail server in a local authority?
235、For the purpose of transferring messages among individual users of the Internet ( ), each local authority designates a particular machine within its domain to handle the domain＇s email activities.This machine is known as the domain＇s mail server.Every e-mail message sent from within the domain is first sent to the domain＇s mail server, which then sends the message on to its destination.Likewise, every e-mail message addressed to a person within the domain is received by the domain＇ s mail server, where it is held until that person requests to see his or her incoming mail.With the role of a domain＇s mail server in mind, it is easy to understand the structure of an individual＇s e-mail address.It consists of a symbol string identifying the person, followed by the symbol @, and followed by the mnemonic name of the mail server that should receive the mail.Thus, the e-mail address of an individual at Addison Wesley Inc.might appear as Shakespeare @ mailroom.aw.com.In other words, the machine known as mailroom within the domain aw.com is the mail server that handles e-mail for the person Shakespeare.It is common practice for a domain to be designed so that the name of the mail server does not have to appear in the e-mail address.In these cases, e-mail addresses consist of merely a symbol string identifying the e-mail recipient, followed by the symbol @, and followed by the mnemonic domain name.Thus, the address above would be reduced to Shakespeare@ aw.com.(4)、Which of the following statements is true?
235、For the purpose of transferring messages among individual users of the Internet ( ), each local authority designates a particular machine within its domain to handle the domain＇s email activities.This machine is known as the domain＇s mail server.Every e-mail message sent from within the domain is first sent to the domain＇s mail server, which then sends the message on to its destination.Likewise, every e-mail message addressed to a person within the domain is received by the domain＇ s mail server, where it is held until that person requests to see his or her incoming mail.With the role of a domain＇s mail server in mind, it is easy to understand the structure of an individual＇s e-mail address.It consists of a symbol string identifying the person, followed by the symbol @, and followed by the mnemonic name of the mail server that should receive the mail.Thus, the e-mail address of an individual at Addison Wesley Inc.might appear as Shakespeare @ mailroom.aw.com.In other words, the machine known as mailroom within the domain aw.com is the mail server that handles e-mail for the person Shakespeare.It is common practice for a domain to be designed so that the name of the mail server does not have to appear in the e-mail address.In these cases, e-mail addresses consist of merely a symbol string identifying the e-mail recipient, followed by the symbol @, and followed by the mnemonic domain name.Thus, the address above would be reduced to Shakespeare@ aw.com.(3)、 When you what to send an e-mail to you friend, it will be sent to which place first?
235、For the purpose of transferring messages among individual users of the Internet ( ), each local authority designates a particular machine within its domain to handle the domain＇s email activities.This machine is known as the domain＇s mail server.Every e-mail message sent from within the domain is first sent to the domain＇s mail server, which then sends the message on to its destination.Likewise, every e-mail message addressed to a person within the domain is received by the domain＇ s mail server, where it is held until that person requests to see his or her incoming mail.With the role of a domain＇s mail server in mind, it is easy to understand the structure of an individual＇s e-mail address.It consists of a symbol string identifying the person, followed by the symbol @, and followed by the mnemonic name of the mail server that should receive the mail.Thus, the e-mail address of an individual at Addison Wesley Inc.might appear as Shakespeare @ mailroom.aw.com.In other words, the machine known as mailroom within the domain aw.com is the mail server that handles e-mail for the person Shakespeare.It is common practice for a domain to be designed so that the name of the mail server does not have to appear in the e-mail address.In these cases, e-mail addresses consist of merely a symbol string identifying the e-mail recipient, followed by the symbol @, and followed by the mnemonic domain name.Thus, the address above would be reduced to Shakespeare@ aw.com.(2)、Why the e-mail address ( ) can be reduced to ( )?
235、For the purpose of transferring messages among individual users of the Internet ( ), each local authority designates a particular machine within its domain to handle the domain＇s email activities.This machine is known as the domain＇s mail server.Every e-mail message sent from within the domain is first sent to the domain＇s mail server, which then sends the message on to its destination.Likewise, every e-mail message addressed to a person within the domain is received by the domain＇ s mail server, where it is held until that person requests to see his or her incoming mail.With the role of a domain＇s mail server in mind, it is easy to understand the structure of an individual＇s e-mail address.It consists of a symbol string identifying the person, followed by the symbol @, and followed by the mnemonic name of the mail server that should receive the mail.Thus, the e-mail address of an individual at Addison Wesley Inc.might appear as Shakespeare @ mailroom.aw.com.In other words, the machine known as mailroom within the domain aw.com is the mail server that handles e-mail for the person Shakespeare.It is common practice for a domain to be designed so that the name of the mail server does not have to appear in the e-mail address.In these cases, e-mail addresses consist of merely a symbol string identifying the e-mail recipient, followed by the symbol @, and followed by the mnemonic domain name.Thus, the address above would be reduced to Shakespeare@ aw.com.(1)、 Which of the following choices isn’t a component of traditional e-mail address?
234、Input, output interface provides a method for transferring information between internal storage and external I/O devices.Peripherals connected to a computer need special communication links for interfacing them with the central processing unit.The purpose of the communication link is to resolve the differences that exist between the central computer and each peripheral.The major differences are:(1) Peripheral are, electromechanical and electromagnetic devices and their manner of operation is different from the operation of the CPU and memory, which are electronic devices.Therefore, a conversion of signal values may be required.(2) The data transfer rate of peripherals is usually slower than the transfer rate of the CPU, and consequently, a synchronization mechanism may be needed.(3) Data codes and formats in peripherals differ from the word format in the CPU and memory.(4) The operating modes of peripherals are different from each other and each must be controlled so as not to disturb the operation of other peripherals connected to the CPU.To resolve these differences, computer systems include special hardware components between the CPU and peripherals to supervise and synchronize all input and output transfers.These components are called interface units because they interface between the processor bus and the peripheral device.In addition, each device may have its own controller that supervises the operations of the particular mechanism in the peripheral.Each peripheral device has associated with an interface unit.Each interface decodes the address and control received from the I/O bus, interprets them for the peripheral, and provides signals for the peripheral controller.It also synchronizes the data flow and supervises the transfer between peripheral and processor.(5)、Which is best title for this passage?
234、Input, output interface provides a method for transferring information between internal storage and external I/O devices.Peripherals connected to a computer need special communication links for interfacing them with the central processing unit.The purpose of the communication link is to resolve the differences that exist between the central computer and each peripheral.The major differences are:(1) Peripheral are, electromechanical and electromagnetic devices and their manner of operation is different from the operation of the CPU and memory, which are electronic devices.Therefore, a conversion of signal values may be required.(2) The data transfer rate of peripherals is usually slower than the transfer rate of the CPU, and consequently, a synchronization mechanism may be needed.(3) Data codes and formats in peripherals differ from the word format in the CPU and memory.(4) The operating modes of peripherals are different from each other and each must be controlled so as not to disturb the operation of other peripherals connected to the CPU.To resolve these differences, computer systems include special hardware components between the CPU and peripherals to supervise and synchronize all input and output transfers.These components are called interface units because they interface between the processor bus and the peripheral device.In addition, each device may have its own controller that supervises the operations of the particular mechanism in the peripheral.Each peripheral device has associated with an interface unit.Each interface decodes the address and control received from the I/O bus, interprets them for the peripheral, and provides signals for the peripheral controller.It also synchronizes the data flow and supervises the transfer between peripheral and processor.(4)、Which of the following statements is true?
234、Input, output interface provides a method for transferring information between internal storage and external I/O devices.Peripherals connected to a computer need special communication links for interfacing them with the central processing unit.The purpose of the communication link is to resolve the differences that exist between the central computer and each peripheral.The major differences are:(1) Peripheral are, electromechanical and electromagnetic devices and their manner of operation is different from the operation of the CPU and memory, which are electronic devices.Therefore, a conversion of signal values may be required.(2) The data transfer rate of peripherals is usually slower than the transfer rate of the CPU, and consequently, a synchronization mechanism may be needed.(3) Data codes and formats in peripherals differ from the word format in the CPU and memory.(4) The operating modes of peripherals are different from each other and each must be controlled so as not to disturb the operation of other peripherals connected to the CPU.To resolve these differences, computer systems include special hardware components between the CPU and peripherals to supervise and synchronize all input and output transfers.These components are called interface units because they interface between the processor bus and the peripheral device.In addition, each device may have its own controller that supervises the operations of the particular mechanism in the peripheral.Each peripheral device has associated with an interface unit.Each interface decodes the address and control received from the I/O bus, interprets them for the peripheral, and provides signals for the peripheral controller.It also synchronizes the data flow and supervises the transfer between peripheral and processor.(3)、Which of the following difference between central computer and peripheral is not mentioned in this passage?
