题目内容

设A为n阶方阵,方程组AX=0仅有零解的充分必要条件是_________.

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Many employer prefer to hire people with work_______. So it's important for you to serve an apprenticeship in a company.

A. experience
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D. education

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A. job
B. project
C. work
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A. individual
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D. private

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A. lowest
B. minimum
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D. extent

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