题目内容

When people become aging, they will lose some of their ability to bounce back from disease

A. to improve in health after one's disease and injury
B. to recover from disease and injury
C. to jump after recovering
D. to run fast

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决策的正确与否在很大程度上决定了组织的兴衰存亡，所以决策只能成功不能失败。()

A. 正确
B. 错误

盈亏平衡点分析法适用于风险型决策。()

A. 正确
B. 错误

In the preceding figure, each of the four squares has sides of length 2x. If triangle PQR

设三阶矩阵A的特征值为λ1＝－1，λ2＝0，λ3＝1，则下列结论不正确的是()．

A. 矩阵A不可逆
B. 矩阵A的秩为零
C. 特征值－1，l对应的特征值向量正交
D. 方程组AX＝0的基础解系含有一个线性无关的解向量