大脑半球表面存在的大沟裂有
ABD
大脑半球表面有三条大的沟裂,分别是中央沟、外侧裂和顶枕裂。本题选ABD。
设(I)计算行列式A;(II)当实数a为何值时,方程组有无穷多解,并求其通解
设A为三阶矩阵,P为可逆矩阵,使得P-1AP=012
Thestudentfoundthenovel_______.Itprovidedhimwithsomuchinformationaboutthesubject.
Herefusedtotelluswhetherhe________(undertake)thejob.
I'm______tograduateinthenexthalfoftheyear.