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【单选题】
设矩阵 的秩为 , 是 阶单位矩阵,下述结论正确的是( )A.
的任意 个列向量必线性无关;
B.
的任意一个 阶子式不等于零;
C.
若矩阵 满足 ,则 ;
D.
通过初等行变换,必可化为 的形式.
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【简答题】Write a letter in 130-150 words. Write a sales letter to an old customer who placed an order with you two years ago,and draw his attention to some new products which represent a great improvement on s...
【简答题】Why do many students calculate they can’t major in English or history?
【单选题】皂膜流量计主要误差来源是时间的测量，因此要求皂膜有足够长的时间通过刻度区。皂膜上升的速度不宜超过（）
A.
12cm/s
B.
8cm/s
C.
10cm/s
D.
16cm/s
E.
4cm/s
【简答题】Why
do many students calculate they can't major in English or history?A. Beacuase English or history majors are considered less interesting in the information age. B. Because when the job market is sh...
【单选题】Why do many students calculate they can’t major in English or history?
A.
Because they are not interested in the humanities.
B.
Because it takes great efforts to do well in these subjects.
C.
Because they may find it hard to land a satisfactory job by majoring in these subjects.
D.
Because the department of English or history offers less scholarship than other departments, such as accounting.
【单选题】皂膜流量计主要误差来源是时间的测量，因此要求皂膜有足够长的时间通过刻度区。皂膜上升的速度不宜超过（）
A.
12cm/s
B.
16cm/s
C.
8cm/s
D.
4cm/s
E.
10cm/s
【单选题】Why do many students calculate they can’t major in English or history?
A.
Because students think English or history is difficult.
B.
Because students don’t like English and history.
C.
Because liberal arts has no advantage in getting employment.
D.
Above ABC
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