【判断题】10 different message signals, each with a bandwidth of 20 kHz, are to be multiplexed and transmitted. If the multiplexing and modulation methods are frequency-division multiplexing (FDM) and double si...
【简答题】“All I could see was two sets of red eyes below me,” said Dave Gatty, an Australian farmer who spent seven days up a tree in remote bush land to escape crocodiles. Gatty, 52, said he was forced to tak...
【简答题】任务型阅读(10’):每空填一词。 Nowadays people use different ways to communicate with each other. And does one always tell the truth when he or she talks with the other on the phone? Or does one sometimes tell a l...