A.X2與X1、X3、X4間電壓為AC0V B.X1與X3、X4間電壓為AC0V C.X2與X1、X3、X4間電壓為AC105V D.X1與X3、X4間電壓為AC105V
A.X2與X1間電壓為AC105V B.X2與X3、X4間電壓為AC0V C.XI與X3、X4間電壓為AC0V D.XI與X3、X4間電壓為AC105V