已知三阶矩阵A的特征值是0,-2, 2,则下列结论不正确的是()
A. 矩阵A不可逆
B. 矩阵A的主对角线上元素之和是0
C. 特征值2与-2的特征向量是正交的
D. Ax=0的基础解系由一个向量组成
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Different schools handle mealtimes in different ways. Some schools early care in the morning. These schools usually provide for their students. Other schools often provide an in-class in the late morning. Do your best to keep the school from giving students food. Young children need small, snacks throughout the day.不同的学校以不同的方式安排用餐时间。一些学校提供早托。这些学校通常给学生提供早餐。还有一些学校在上午晚些时候提供课堂点心。尽量让学校避免给学生吃垃圾食品。小孩子一整天都需要健康的小点心。
Computer (1) is an intrusive (2) that infects computer (3) by inserting (4) ofitself in those files. The copies are usually executed when the file is loaded into (5),allowing them to (6) still other files, and so on. Viruses often have damaging side effectssometimes intentional, sometimes not--such as destroying a computer's hard (7) or taking up(8)space that could otherwise be used by program.Avirus is a program, made by either a (9) or not. It is not so easy to make one, butmany people know how to do it, for example, you may know that you have to know some exact computer (10) to make a computer virus.
根据我国《行政诉讼法》的规定,以下表述不属于撤销判决的法定情形的是()。
A. 违反法定程序的
B. 主要证据不足的
C. 适用法律、法规、规章错误的
D. 明显不当的
以下关于变更判决的说法错误的是()。
A. 变更判决只适用于行政机关已经做出并存续的行政处罚。
B. 对于行政机关尚未作出或已经自行撤销的行政处罚,变更判决不能直接适用。
C. 法院判决变更时,原则上不得做对原告不利的变更。
D. 如果受害人对行政处罚不服提起诉讼,法院认为处罚结果太轻的,不能判决加重处罚。