解析:地球上不同位置的人释放手中石块后,石块受的重力的方�是竖直�下的,即指�地球中心.即石块下落路径的方�总是指�地球中心的。 Template




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tomski解析:地球上不同位置的人释放手中石块后,石块受的重力的方�是竖直�下的,即指�地球中心.即石块下落路径的方�总是指�地球中心的。 coloring