题目内容

7

A. Young athletes who may have a concussion should be taken off the field as gently as possible.
B. Young athletes who may have a concussion should be kept where they are until health care professionals arrive.
C. Only health professionals are qualified for evaluating and caring for concussions.
D. A doctor's written approval is necessary for an athlete with a concussion to return to the sport.

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n阶方阵A可对角化的充要条件是A有n个相异的特征值.

A. 对
B. 错

n阶方阵A可对角化的充要条件是A有n个不相同的特征向量.

A. 对
B. 错

n阶方阵A可对角化的充要条件是A有n个线性无关的特征向量.

A. 对
B. 错

n阶方阵A可对角化的充要条件是A的任一特征值的代数重数与其线性无关的特征向量的个数相同.

A. 对
B. 错

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