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北京大学1.作文:二十年后的中国。2.当月球和地球的半径以及两个球心之间的距离都缩小为原来的十分之一,此时人的重力为原来的多少倍?
Peking University 1. Composition: China 20 years later. 2. When the radius of the Moon and the Earth, and the distance between the two centers of the ball, are reduced to one-tenth of the original, how many times is the gravity of the human?