胃溃疡首选手术方式是
A
暂无解析
设A为3阶方阵，特征值分别为-2，1，1，则|5A-1|=______________.
Ourcountryisnolongerwhatit_____.
Willitbe_____beforetheprofessorreturns?
中美是什么时候建交的()
Thereareoversix________students_____partintheentranceexaminDongchengonMaythesecond.