33.通信载体A A communication carriers B communicating carry C communicated movement 34.基本接入C a basic access B basic entrance C. base access 35.语音编码A oding B outing function are implemented in the optic A. more sophisticated intelligence to control and manage the network B. self-heali C. direct access to the optical network 37. Therefore, to handle various types of traffic A. this in itself would be big enough challenge to meet B this allow the oa to amplify more signals simultaneously C. today's network will gave to be progressively optimized D the different types of traffic can be assigned to different wave- 38. Second, the development of gain equalization techniques has enabled a much flatter response and allow A. much more exacting requirements for quality differentiation B. a number of these amplifier to be connected in series C. the majority of traffic in the near future D. our understanding of the properties of light 39. For this reason, the growth of various application, such as telephony, Internet, video transmission, computer communication and database access on the network. D A would not likely to imagine the communication network of today B. be only at the beginning of what is possible C. have already been demonstrated D leads directly to an increase in the demand placed 40. The major advance that has led to the WDM revolution A. can boost the power of all wavelength B. will be used to convey large amount of video information in the future C has been the invention of oa D is access to the optical network 41. An asynchronous serial data link is said to be character oriented A. since the line is in an idle state B. because it has a duration of r seconds C as information is transmitted in the form of groups of bits called characters D. since it consists of 2 to 4 control bits 42. When the transmitter wishes to send data, it first A A places the line in a space level33. 通信载体 A A. communication carriers B. communicating carry C. communicated movement 34. 基本接入 C A. basic access B. basic entrance C. base access 35. 语音编码 A A. voice encoding B. sound encoding C. voice codes 36. As more routing function are implemented in the optical place, we need . A. A. more sophisticated intelligence to control and manage the network B. self-healing properties and fast restoration times C. direct access to the optical network D. live video coverage of a medical operation 37. Therefore, to handle various types of traffic, C. A. thisin itself would be big enough challenge to meet B. this allow the OA to amplify more signals simultaneously C. today's network will gave to be progressively optimized D. the different types of traffic can be assigned to different wave￾length, as required 38. Second, the development of gain equalization techniques has enabled a much flatter response and allow . B. A. much more exacting requirements for quality differentiation B. a number of these amplifier to be connected in series C. the majority of traffic in the near future D. our understanding of the properties of light 39. For this reason, the growth of various application, such as telephony, Internet, video transmission, computer communication and database access on the network. D. A. would not likely to imagine the communication network of today B. be only at the beginning of what is possible C. have already been demonstrated D. leads directly to an increase in the demand placed 40. The major advance that has led to the WDM revolution . C. A. can boost the power of all wavelength B. will be used to convey large amount of video information in the future C. has been the invention of OA D. is access to the optical network 41. An asynchronous serial data link is said to be character oriented, _______________. C. A. since the line is in an idle state B. because it has a duration of T seconds C. as information is transmitted in the form of groups of bits called characters D. since it consists of 2 to 4 control bits 42. When the transmitter wishes to send data, it first ______________. A A. places the line in a space level