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人感冒时，会出现畏寒、发热症状；用退热药后，可出现全身出汗、体温下降现象。在发热和退热过程中，人体产热和散热的关系为（）A.
发热时，产热大于散热
B.
发热时，散热大于产热
C.
退热时，散热大于产热
D.
退热时，产热大于散热
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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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