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【单选题】
组距、组限和组中值之间的关系是( )。A.
组中值=(上限+下限)／2
B.
组距=(上限一下限)／2
C.
组中值=(上限一下限)／2
D.
组限=组中值／2
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【简答题】设矩阵 ，求A的特征值与特征向量。
【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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