F1必然大于零, 也就是说BOX 和 BALL 有CONTACT。静力条件下, 有接触就不会分离吧? 你看对不?
F1必然大于零, 也就是说BOX 和 BALL 有CONTACT。静力条件下, 有接触就不会分离吧? 你看对不?
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