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【单选题】
设矩阵Am×n的秩r(A)＝m＜Em，Em为m阶单位矩阵，下述结论中正确的是A.
A的任意m个列向量必线性无关．
B.
A的任意一个m阶子式不等于零．
C.
A通过初等行变换，必可以化为(Em，0)形式．
D.
非线性方程组Ax＝b一定有无穷多组解．
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【单选题】—Have you finished your homework _____? —Yes, I have _____ finished it. [ ]
A.
yet, yet
B.
already, already
C.
yet, already
【单选题】-When you your homework? -I had finished it before he back. [ ]
A.
have, finished, came
B.
have, finished, was coming
C.
did, finish, came
D.
did, finish, was coming
【简答题】新发展理念是针对我国经济发展进入新常态、世界经济复苏乏力形势提出的________之策。
【单选题】— I have finished my homework. — When ____ you ____ it? [ ]
A.
have; finished
B.
do; finish
C.
will; finish
D.
did; finish
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