1、无线电技术。马可尼利用无线电波技术试验成功无线电报机后,加拿大人费森登又发明了无线电广播。2、载波通信技术。1918年,架空明线4路载波电话机问世。载波通信的出现,改变了一对线传送一路电话的局面。3、电子计算机技术。1946年2月5日,世界上第一台电子计算机 ENIAC 正式宣告诞生。计算机被认为20世纪最重要的发明。4、电视技术。20年代电视的发明深刻地改变了人们的生活,它加大了信息传播速度和信息量,使世界开始变小。 1, radio technology. After Marconi used radio wave technology to test a successful radios, Canada-born Fessenden invented the radio broadcast. 2, carrier communication technology. In 1918, the overhead line 4 carrier phone came out. The emergence of carrier communications has changed the situation that one pair of lines transmit all the way to the telephone. 3, electronic computer technology. February 5, 1946, the world’s first electronic computer ENIAC was officially announced. Computers are considered the most important invention of the 20th century. 4, television technology. The invention of television in the 1920s has profoundly changed people’s lives. It has increased the speed and amount of information disseminated and made the world smaller and smaller.