题目内容

— We’ll be back for our school’s ________ anniversary ceremony.—I see. That means you'll have a get-together with your classmates in ________ years.

A. fifteen;seven
B. fifteenth;seven
C. fifteen;seventh
D. fiveteenth;seven

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请写出以下基数词的序数词。5

请写出以下基数词的序数词。eleven

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设A是mxn的矩阵,非齐次线性方程组Ax=b有解的充分条件是()

A的行向量组线性相关
B. A的列向量组线性相关
C. R(A)=n
D. R(A)=m

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