【单选题】Why did the little girl put her gloves into her boots? 查看材料
A.
She worried to lose them.
B.
To make her teacher find them.
C.
She didn't know the reason.
D.
She didn' t like them.
【单选题】It is easy to see why many little girls prefer to ______ with the male role, but the girl who does find the male role more attractive is faced with a dilemma.
【多选题】下列说法正确的是 [ ]
C.
AgF,AgCl,AgBr,AgI的溶解性依次减小
D.
F 2 ,Cl 2 ,Br 2 、I 2 的氧化性逐渐减弱,都能与Fe反应生成Fe 3+
【单选题】—Why do you like Mary? —Because she is honest girl.
【简答题】设A为n阶矩阵,|A|≠0,A*为A的伴随矩阵,E为n阶单位矩阵.若A有特征值λ,则(A*)2+E必有特征值________.
【单选题】设三阶矩阵 ,若 的伴随矩阵的秩为1,则必有( ).
【单选题】设3阶矩阵 ,若A的伴随矩阵的秩为1,则必有