After receiving a message at startup stating that ‘One or mo

A. Registry utility

B. MSCONFIG utility

C. Control Panel

D. Event Viewer

is the sending and receiving of the message by computer. It is a fast, low-cost way of communicating worldwide。

A．WWW

B．E-mail

C．TFTP

D．TELNET

After receiving the stores, you should sign on the ____.

A.engine logbook

B.delivery docket

C.store list

D.maintenance book

One of my friends sent me a message just now．（改为同义句）

_________ _________ _________ _________sent me a message just now．

A. Event Viewer

B. System Information

C. Scandisk

D. Dr. Watson

IP multicasting is a set of technologies that enable efficient delivery of data to many locations on a network. Rather than making multiple copies of a message intended to be distributed to multiple recipients at the(71) of origin of a message, multicasting initially sends just one(72) and does not copy it to the individual recipients until it reaches the closest common point on the network, thereby(73) the bandwidth consumed. Network performance is significantly(74) because it isn't bogged down with the processing and transmission of several large data fries; each receiving computer doesn't have to(75) the transmitting server for the file.

A．point

B．bottom

C．head

D．sight

Electronic mail, or mail, as it is known to its many fans, has been around for over two decades. Typically, email systems support five basic functions, as described below.(41)refers to the process of creating messages and answers.(42)refers to moving messages from the originator to the recipient.(43)has to do with telling the originator what happened to the message. Was it rejected? Was it lost?(44)incoming message is needed. So people can read their email.(45) is the final step and concerns what the recipient does with the message after receiving it.

A．Composition

B．Transfer

C．Reporting

D．Displaying

When can routine communications be resumed on a frequency or channel on which radio silence has been imposed ________．

A.After determining that the frequency or channel appears to be no longer in use

B.After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications

C.After the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded

D.Routine communications can resume if，in the Master's opinion，communications on that frequency or channel will not interfere with emergency communications