题目内容

设A,B都是n阶正交矩阵,则AB也是正交矩阵.

A. 对
B. 错

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n阶矩阵A, B, 若矩阵A可逆,则AB与BA有相同的特征值.

A. 对
B. 错

The government has _________ strong opposition to its plans to raise income tax.

A. experienced
B. encountered
C. pleased
D. decorated

The people in this country have _________almost a decade of economic hardship.

A. adopted
B. lifted
C. existed
D. endured

Yesterday morning, shares seemed to _______ Monday’s collapse.

A. recover from
B. hear from
C. invented from
D. keep from

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