胸主动脉全部展现最佳的体位是
C
暂无解析
设函数y=sinx^2+2x，求dy
Iwon't________thosechildrenmakinganoiseinmyhouse!
Iknowitisn’timportantbutIcan’thelp________aboutit.
曲线在点（0，-1）处的切线方程为________.
设A为三阶矩阵,P为可逆矩阵,使得P-1AP=012