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金矿要多大才能显著影响当地的重力加速度值？ - 知乎
source link: https://www.zhihu.com/question/318352206/answer/638278379
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已知，g=GM/r^2，其中G为万有引力常数，M为地球质量，r为地球半径。若需g发生显著变化，通常可以认为△g=…
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