A.2
B.1
C.3
D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]设,则=( )A.2B.1C.3D.-1
[单选题]A.4321┻1234B.543┻345C.654┻456D.765┻567E.876┻678
[单选题]A.4321┻1234B.543┻345C.654┻456D.765┻567E.876┻678