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【单选题】
对于齐次线性方程组的系数矩阵化为阶梯形时( )A.
只能进行行变换
B.
只能进行列变换
C.
不能进行行变换
D.
可以进行行和列变换
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举一反三
【简答题】A.Two rings. B.A gold necklace. C.A ring and two gold necklace. D.Two rings and a gold neck/ace.
【简答题】There was a king who gave his daughter a beautiful diamond necklace. The necklace was stolen and his people in the kingdom searched everywhere but could not find it. So the king asked to search for it...
【单选题】—What a beautiful necklace! —Yes.But the necklace I __________ 80 dollars is made of glass.
A.
paid for
B.
spent on
C.
cost on
D.
bought for
【简答题】A) Two rings. B) A gold necklace. C) A ring and two gold necklace. D) Two tings and a gold necklace.
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