题目内容

设A是三阶不可逆矩阵，α,β是线性无关的两个三维列向量，且满足Aα=β，Aβ=α，则 ()．

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对任意实数x，恒有()．

如题14图所示，A是半径为1的圆O外的一点，OA=2，AB是圆O的切线，B是切点，弦BC∥OA，连接AC．则阴影部分的面积等于 ()．

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What/Who should students contact if they want to get a summer job？

A. The Student Union.
B. The Student Employment Office.
C. The Workers' Union.
D. The Student Part-time Job Office.