mid-termtest/exam
举一反三
- 每5分钟运行一次crond任务exam,下面哪项正确？ A: */i2****exam B: 5/* * * * * exam C: * **/12** exam D: */5 * * * * exam
- 已知三阶矩阵$A$满足$\mid A-E\mid=\mid A-2E\mid=\mid A-3E\mid=0$，则$\mid A\mid$=( )。 A: $4$ B: $6$ C: $12$ D: $3$
- I had been preparing for the exam for a year and now I was raring to go. A: was nervous about the exam B: was confident about the exam C: was anxious about the exam D: was eager to take the exam
- 设$A,B$是$n$阶正交矩阵，且$\mid A\mid=-\mid B\mid$，则( ). A: $A+B$可逆 B: $A+B$不可逆 C: $\mid A+B\mid=1$ D: $\mid A+B\mid=-1$
- Only when you have acquired a good knowledge of the field, . A: you can pass the exam B: you passed the exam C: can you pass the exam D: you will pass the exam