若三阶矩阵A的特征值是-1,1,2,则A*+2E的特征值是______。
A.2,3,5 B.-2,0,1 C.4,0,1 D.3,2,0
参考答案:C
The Browns are from England. They live in New York. Mr. Brown is a doctor. Mrs. Brown doesn’t work. She has a lot of housework to do every day. They have two sons. Bob is ten years old and Tom is eight years old. They are students. Bob doesn’t want to be a doctor but Tom does. Bob wants to be a pilot(飞行员). Their daughter, Molly, doesn’t go to school. She is only four years old. Molly wants to be a teacher.
小题1:Do the Browns live in America now?
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小题2:What does Mr. Brown do?
小题3:How many people are there in Brown’s family?
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在批处理系统兼分时系统的系统中,往往由分时系统控制的作业称为______作业,而由批处理系统控制的作业称为后台作业。