设<img src="https://zk.995w.com/lqwvjeImg/f5/f5f2fccaf79db4bc2c0a8e20f65618ad.png" style="width:16px;height:16px;">是<img src="https://zk.995w.com/lqwvjeImg/20/20232c35a9993c0f95bcb52a401f7cb5.png" style="width:12px;height:15px;">阶实对称矩阵,则下列哪个选项不是<img src="https://zk.995w.com/lqwvjeImg/f5/f5f2fccaf79db4bc2c0a8e20f65618ad.png" style="width:16px;height:16px;">为正定矩阵的充要条件( ).<br>·<img src="https://zk.995w.com/lqwvjeImg/8b/8b591804c76eb84020305b46c000175e.png" >的特征值全大于0<br>·<img src="https://zk.995w.com/lqwvjeImg/fe/fec1fddb13d00acf104f7731be04e9dc.png" ><br>·<img src="https://zk.995w.com/lqwvjeImg/8b/8b591804c76eb84020305b46c000175e.png" >的顺序主子式全大于0