A.r=0
B.r=1
C.0<r<1
D.-1<r<0
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.相电压B.C.线电压D.
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.相电压B.C.线电压D.
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]( ).A.B.C.D.