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【简答题】
在免费行李限额以内____________the free luggage___________
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【单选题】设 为 3 阶对称阵, 的秩 ,且满足条件 ,则 的特征值为( )。
A.
0 ， -2 ， -2
B.
0 ， 0 ， -2
C.
-2 ， -2 ， -2
D.
0 ， 0 ， 0
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【单选题】-----It is long since we met last. Haven’t you graduated from college yet? ----- _____. I ____ English for 3 years in Lanzhou University.
A.
No; study
B.
Yes; have studied
C.
No; am studying
D.
Yes; studied
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