20世纪是技术进步的世纪,一项项伟大的科技发明促进了20世纪生产力的飞速发展,创造了20世纪亘古未有的财富。尽管20世纪也充斥着血雨腥风,但在历史的进程中,技术进步永不停息。航空技术缩短了20世纪的天空1903年12月17日,莱特兄弟制造的一台重约77公斤的8800瓦汽油发动机和根据风洞升力表设计的螺旋桨,并 The 20th century was a century of technological progress. A great invention of science and technology promoted the rapid development of productive forces in the 20th century and created an unprecedented wealth in the 20th century. Although the 20th century is also full of bloody events, technological progress has never stopped in the course of history. Aviation technology shortened the sky of the 20th century On December 17, 1903, a Wright Brothers manufactured a 8800-W gasoline engine weighing about 77 kg and a propeller designed according to a wind-tunnel lift gauge and