设<img src="/lqwvjeImg/aa/aa2d93b69625e8136c2e7596647ebd14.png">与<img src="/lqwvjeImg/e0/e03087fe4c926789854e3c658a728501.png">都是 <img src="/lqwvjeImg/63/632f0fd61e75e4490da73b45b272d2b6.png"> 阶正交矩阵,正确的叙述是( )。<br>·<img src="/lqwvjeImg/fa/fada5a288a07e4807c6de08589473bdf.png">必是正交矩阵;<br>·<img src="/lqwvjeImg/34/347d4b798ca194800aca9b762f1ff415.png">必是正交矩阵;<br>·<img src="/lqwvjeImg/de/def0213502c6733c5e57c56621423d10.png">必是正交矩阵;<br>·以上A、B、C三种说法都不对。