记者：杨伶、熊茂伶 编导：唐子晔 新华社音视频部制作 ...

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“现有一质量为60kg的普通高中生从11层自由而下，不计空气阻力，求该学生下落的平均速度……”这是近日出现在作业帮APP上 ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

Notice: The content above (including the videos, pictures and audios if any) is uploaded and posted by the user of Dafeng Hao, which is a social media platform and merely provides information storage ...

台当局缉私系统错误率高达99.9%？王世坚怒呛：官商勾结A百姓I？

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