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Ice piers Newton's first law Wang Yaping physics
03-24
Newton Newton's first law The law of inertia acceleration The second law
02-23
![How good are the children in class now? Astronauts use ice piers in space to explain basic scientific knowledge[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)
