【单选题】The switchboards for AC systems differ from the DC switchgear in that the open type panels are generally and the dead-front switchgear is the common rule.
【单选题】The switchboards for AC systems differ from the DC switch gear in that the open type panels are generally __________and the dead-front gear is the common rule.
【单选题】The switchboards for a.csystems differ from the d.cswitch gear in that the open type panels are generally_____ and the dead-front switch gear is the common rule.
【单选题】In addition to a display device, such as a monitor, a computer display system also requires graphics ____ that generates the signals for displaying an image on the screen.