题目内容

Our human friends sometimes may make us bored, but the friends in books may also be hurt by us.

A. Right
B. Wrong

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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 ().

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 ().

Your wish to visit some far-off places can be realized by just reading books.

A. Right
B. Wrong

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