A research paper states, 'The experiment's design, though theoretically sound, revealed practical challenges in implementation due to unforeseen logistical constraints.' Which of the following best interprets this statement regarding the experiment's design?

Considering the nuances of English vocabulary, which sentence correctly uses the word 'vicinity'?

在堆排序过程中，建立初始堆的步骤是？

在Java中，以下哪项是使用BufferedReader从键盘读取数据的正确方式？

已知三阶矩阵 A 的特征值为 λ1, λ2, λ3，且满足 λ1 + λ2 + λ3 = 0，λ1λ2 + λ2λ3 + λ3λ1 = -1，求 A 的行列式 det(A) 的值。