选区和路径都必须是封闭的。
错误
暂无解析
若α1,α2,α3是Ax=b(b≠0)的线性无关解,证明α2-αl,α3-αl是对应齐次线性方程组Ax=0的线性无关解
Idon’twanttobuythesweaterbecauseIdon’tlikethecolor.__________,itistooexpensive.
Only5_____ofthepopulationofAmerica_____farmers.
I__________themovie,butnowIhardlyrememberit.Canyouremindmeofitsname?
Internet接入控制不能对付以下哪类入侵者?()