history, fulcrum, man using a lever to move a boulder, vintage illustration, 19th century, victorian - 控制桿 幅插畫檔、美工圖案、卡通及圖標翹翹板, 男人, 插圖
teenage girl in high school classroom making physics construction science engineering technology mathematics stem project with asian classmate - 控制桿 個照片及圖片檔少年男女, 兒童, 青春期
iron balls of different sizes and weights keep a consistent balance of businessman standing on a superimposed seesaw, balance concept, business balance concept - 控制桿 幅插畫檔、美工圖案、卡通及圖標平衡, 金融
raising revenues or profits, economic stimulus, rising investment returns, wealth management or monetary policy, huge punches to the seesaw to make the gold pile jump - 控制桿 幅插畫檔、美工圖案、卡通及圖標金融, 經濟衰退, 矢量圖
Preeminent Greek mathematician and inventor, Archimedes, demonstrates the use and power of the lever.阿基米德
old engraved illustration of mechanical powers, examples of the practical application of the mechanical power - 控制桿 個照片及圖片檔插圖, 齒輪 - 機件, 雕刻圖像
Image of a man standing in a voting machine with its curtains pulled back, touching a lever, in a room, Chicago, Illinois, circa 1905.投票, 1900-1909, 摄影
William Hesketh Lever , 1st Viscount Leverhulme, 3rd August 1920. He made his fortune as a soap manufacturer and founder of Lever Brothers.
wooden seesaw balance scale on a white background, representing concepts of comparison and instability - 控制桿 個照片及圖片檔
