一、研究的目的我们伟大的祖国有悠久的历史和丰富的文化遗产。几千年来,我们的祖先用自己的劳动和智慧垦殖了广大富饶的土地。他们在祖国的士地上辛勤的劳动着、创造着,留下了无数宝贵的经验和光辉的科学发明。但经过了长时期的封建社会,又陷入近百年来半封建、半殖民地的悲惨地位。因而使生产长期停滞不前,科学上的创造发明不仅没有得到应有的重视和发 First, the purpose of research Our great motherland has a long history and rich cultural heritage. For thousands of years, our ancestors have cultivated vast and fertile land with their own labor and wisdom. They worked hard at the taxis of the motherland, created, and left countless precious experiences and glorious scientific inventions. However, after a long period of feudal society, it plunged into the tragic position of semi-feudal and semi-colonial areas in the past century. So that the long-term stagnation of production, not only did not get the scientific attention and invention