第5题: [单项选择]奈奎斯特定理描述了有限带宽、无噪声信道的最大数据传输速率与信道带宽的关系。对于二进制数据,若最大数据传输速率为6000bps,则信道带宽B=( )。 A. 300Hz B. 6000Hz C. 3000Hz D. 2400Hz 参考答案:C 答案解析:[解析] 奈奎斯特准则指出:如果间隔为;π/ω (ω=2πf),通过理想通信信道传输窄脉冲信号,则前后码元之间不产生相互窜扰。因此,对于二进制数据信号的最大数据传输速率 Rmax与通信信道带宽B(B=
第7题: [单项选择]现场需要心肺复苏抢救的特危重患者通常() A. 小于1% B. 5%~10% C. 10%~15% D. 小于5% E. 以上都不是 参考答案:D
第8题: [单项选择]Passage Three Questions 32 to 35 are based on the passage you have just heard. A. A visit to a prison. B. The influence of his father. C. A talk with some miserable slaves. D. His experience in the war between France and Austria. 参考答案:A 答案解析:[听力原文]32-35 The worldwide organization of the Red Cross stems from the idea of Henri Durant,