[名词解释] 系统接地(system earthing)
[名词解释] 接地装置(earthing system)
[名词解释] 接地母排(earthing bar)
[名词解释] 接地线(earthing conductor)
[名词解释] 保护线(PE线,protective conductor)
[名词解释] 保护中性线(PEN线,protective and neutral conductor)
[多选题] 电涌保护器(Surge Protective Devices,SPD)的类型包括()A . 开关型SPDB . 限压型SPDC . 限流型SPDD . 混合型SPD
[试题]protective blanket 选择Theatmosphereagainactsourprotectiveblanketon_____[A]stars[B]sun[C]earth[D]space
[单选题]A.dditives _____ protective layers on metal surfaces guarding them against corrosion.A.damageB.form.C.dissolveD.contaminate
[单选题]Additives () protective layers on metal surfaces guarding them against corrosion.A . damageB . formC . dissolveD . contaminate