【单选题】A,B为n阶矩阵,若(A+B)(A-B)≠A^2-B^2,则必有( )
【简答题】在记账凭证账务处理程序下,记账凭证一般使用__________,________ 和 ______等专用记账凭证,也可采用_______ .
【单选题】-Aren't you from Dandong? -___________. I'm from Shenyang.
【单选题】You are from Australia,aren't you? _________ . I 'm from Canada.
【简答题】设A为正定Hermite矩阵,B为反Hermite矩阵.试证明:AB与BA的特征值实部为零. (2)设A是n(n>1)阶正定矩阵.α是非零列向量,且α∈Rn.令B=AααT,求B的最大特征值以及B的属于这个特征值的特征子空间的维数和一个基.
【判断题】计算元件功率不能使用叠加定理。A. √ B. ×
【单选题】听力原文:Hi, I'm calling to change my destination from Seoul to Busan. (A) I'm sorry I don't have any change. (B) Yes, Seoul is beautiful at this time of the year. (C) What is your reservation number? (27...
【简答题】Long ago there was a poor farmer in Russia. He had been very__ 1 __with everything he had. However,when he found his elder brother was_2__than him,he felt disappointed. So he__ 3 _hard about how he co...