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【判断题】
铁路信号分为视觉信号和听觉信号A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】设矩阵 ，求A的特征值与特征向量。
【简答题】证明特征值与特征向量的性质2：设λ为方阵A的特征值，则对于任意k，λ k 为A k 的特征值；并且，对于任一多项式f(x)=a m x m +…+a 1 x+a 0 ，f(λ)为方阵f(A)=a m A m +…+a 1 A+a 0 E的特征值.
【简答题】学校课程中的学科就是科学。
【单选题】The climate of Earth is changing. Climatologists are confident that over the past century, the global average surface temperature has increased by about half a degree Celsius. This warming is thought ...
A.
The burning of fuels such as coal or oil.
B.
The clearing of forests.
C.
The cultivation of farmland.
D.
The negative consequences of human activities.
【单选题】The climate of Earth is changing. Climatologists are confident that over the past century, the global average surface temperature has increased by about half a degree Celsius. This warming is thought ...
A.
The burning of fuels such as coal or oil.
B.
The clearing of forests.
C.
The cultivation of farmland,
D.
The negative consequences of human activities.
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