lever principle

基本解釋

Which of the following involves a lever principle?
以下哪項(xiàng)是與杠桿原理有直接關(guān)系的？
Lever principle is a basic principle that all kinds of weighing apparatus in ancient time must abide by.
杠桿原理是古代各類衡器工作時(shí)必須遵循的基本原理，在傳統(tǒng)計(jì)量發(fā)展過程中具有重要作用。
Lever principle is a basic principle that all kinds of weighing apparatus in ancient time must abide by. It had played an important role in the developing process of traditional metrology.
杠桿原理是古代各類衡器工作時(shí)必須遵循的基本原理，在傳統(tǒng)計(jì)量發(fā)展過程中具有重要作用。