• 2022-06-15
    17d6250f7313c59.png开环[img=584x164]17d6250f808af75.png[/img]Nyquist曲线绘制如图所示,其穿越次数为( )
    A: N+ =1/2,N-= 1/2
    B: N+ =0,N-= 1/2
    C: N+ =1/2,N-= 0
    D: N+ =0,N-= 0