某宇航�在地球上能举起50kg的东西,在某星球表面能举起100kg的,为什么人的作用力在两个星球一样? 知乎 Template




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tomski某宇航�在地球上能举起50kg的东西,在某星球表面能举起100kg的,为什么人的作用力在两个星球一样? 知乎 coloring