To maintain a telephone conversation over the Internet. The voice packets must arrive at their destination in ()

A．a continuous stream

B．a burst stream

C．a delayed stream

D．a burst mode

[主观题]B．etween1974and1997,thenumberofoverseasvisitorsexpanded_________27%.A)byB)forC)toD)in

[单选题]It is difficult to maintain our present rate of increase and in the meantime keep inflation____control..A． underB． beneathC． withinD． below

[单选题]In order to maintain the reach of a typical 100G WAN transport system(~1500km), several system improvements have to be made to recover the lost (93)，including the use of low-loss low-nonlinearity(94)，Raman amplification,and stronger error correction.

[单选题]The project manager must maintain an effective communication link with the customer's satisfaction with the progress of the project. The project manager maintains this link through (71).(71)A．periodic project reports, periodic visits to the customer

[主观题]A．ccording to the conversation, in the chemical fertilizer market, the demand the supply.

[单选题]Who has responsi bilities to maintain the ship？（）A . Flag StateB . shipownerC . crewoftheshipD . managecompanyoftheship

[主观题]how do you maintain emergency battery ?

[单选题]What is the conversation mainly about?A． The woman’s study.B． The woman’s friend.C． The woman’s trouble.

[单选题]What is the conversation mainly about?A． Buying some booksB． Repairing a watchC． Finding a place

[单选题]C．onversation becomes weaker in a society that spends so much time listening and being talked to _______ it has all but lost the will and the skill to speak for itself.A． as B which C that D what