反向开关晶体管
reversely switched dynistor
RSD
canine adenoviruses
canine adenovirus-2
方向选择器开关
direction selector switch
防爆电控气动开关球阀
antidetonation electric control pneumatic switch ball valve
防爆开关
the switch against exploding
防爆馈电开关
explosion-proof feed switch
防爆自动空气开关
anti-explosion automatic air switch
反向电流自动断路开关
automatic reverse current cutout
反向电流自动断开开关
automatic reverse current cutout