设行列式|211 a21 231,212..|=3,则|3211 |等于() A.-81 B.-9 设行列式|211 a21 231,212..|=3,则|3211 |等于() A.-81 B.-9 C.9 D.81 分类:西安交通大学发电厂电气设备 题型:选择题 查看答案
( )John: How often do you go to the cinema? Mary: ( )John: How often do you go to the cinema? Mary: ____________ .(本题1.0分) A、 a w 分类:西安交通大学发电厂电气设备 题型:选择题 查看答案
Did you have any trouble in getting there? ---No. Did you have any trouble in getting there? ---No. _____ I would have telephoned 分类:西安交通大学发电厂电气设备 题型:选择题 查看答案
计算行列式D=|3 -4 1 2,5 5 2 0,-1 3 0 -3,2 -3 1 4| 计算行列式D=|3 -4 1 2,5 5 2 0,-1 3 0 -3,2 -3 1 4| 分类:西安交通大学发电厂电气设备 题型:选择题 查看答案