A brief introduction to the history of world machinery development ~ 100~200 words is enough
The history of world machinery development can be divided into three stages: first, from the emergence of urban civilization in 7000 BC to the end of the seventeenth century, it is the stage of machinery origin and ancient machinery development; Second,18th century to the beginning of 20th century is the development stage of modern machinery; Three: From the beginning of the 20th century to the present, it is the development stage of modern machinery.