
A.a=-1,b=1
B.a=1,b=-1
C.a=2,b=1
D.a=2,b=2
[单选题]A.a=-1,b=1B.a=1,b=-1C.a=2,b=1D.a=2,b=2
[单选题]A.a=-1,b=1B.a=1,b=-1C.a=2,b=1D.a=2,b=2
[单选题]A.a=-1,b=1B.a=1,b=-1C.a=2,b=1D.a=2,b=2
[单选题]A.a=-1,b=1B.a=1,b=-1C.a=2,b=1D.a=2,b=2
[单选题]A.a=-1,b=1B.a=1,b=-1C.a=2,b=1D.a=2,b=2
[单选题]A.n=1B.n=2C.n=3D.n=4
[单选题]A.n=1B.n=2C.n=3D.n=4