fucking stupid

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老子不选物理，政治最牛逼，物理是什么垃圾

选化学，物理没有前途

不会，出题人狗屁不通

1234567900什么狗屁题目

http://sir one question , a block kept on roof with friction and another hanging mass connected to it by pulley if this hanging block given accn then radius of curvature for this block

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