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【简答题】
设α1,α2,…αn是n维线性空间V的一组基,β1,β2…βs是V的一组向量,且有n*s矩阵满足 （β1，β2…βs）=（α1，α2，…αn）A 证明：矩阵A的秩等于向量组β1,β2…βs的秩
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【单选题】Television is now playing a very important part in our life. But television, like other things, has both advantages and disadvantages. Do the former overweighs the latter? In the first【B1】, television...
A.
position
B.
action
C.
place
D.
point
【单选题】听力原文：W: What a day ! I'm exhausted. M: Well it's not over yet. W: Yeah, but it's over for me. I have to go back home and be there when the kids get home. M: Oh, that's right. I have to go back to the ...
A.
Her kids will arrive home after school.
B.
She is too exhausted to work.
C.
She has finished her work.
D.
The man does not ask her to go back to the office.
【单选题】与 page 指令 等价的是 ( )。
A.
B.
C.
" java.util.*" %>
D.
import java.util.*; import java.text.* ;
【简答题】太阳能电池是基于( )效应研制而成的光电子器件。
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