A. 30000K B. 60000K C. 10000K D. 5000K
A. 1.0 B. 1.2 C. 1.7 D. 2.2
A. 正确 B. 错误
A. 10µA B. 20µA C. 30µA D. 40µA
A. Up≤0.6Uw B. Up≤0.8Uw C. Up≤1.0Uw D. Up>0.8Uw
A. 100m B. 200m C. 300m D. 400m
A. 电涌保护器(SPD)surge protective device B. 电压开关型SPD voltage switching type SPD C. 限压型SPD voltage limiting type SPD D. 组合型SPD combination type SPD
A. 接地线earth conductor B. 共用接地系统common earthing system C. 接地基准点earthing reference point,ERP D. 等电位连接