• 2022-06-30
    下列变量组是一个闭回路的有( )
    A: (x11,x23,x33,x21,x32,x12)
    B: (x33,x23,x14,x24,x12,x32)
    C: (x11,x33,x45,x13,x44,x24,x21,x35)
    D: (x15,x22,x34,x12,x24,x32)
    E: (x13,x23,x34,x12,x24,x33)