Что думаешь? Оцени!
https://physics.stackexchange.com/questions/31326/is-a-hard-drive-heavier-when-it-is-full
，更多细节参见体育直播
Фото: Liesa Johannssen / Reuters，详情可参考体育直播
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· 杨勇 · 来源：tutorial资讯