单项选择题

根据规范要求，距建筑物30米的广场，室外景观照明灯具宜采用下列哪种接地方式？

A.TN-S
B.TN-
C.CTT
D.IT
<上一题 目录 下一题>
热门 试题

单项选择题
某地区海拔高度800米左右，10kV配电系统采用中性点低电阻接地系统，10kV电气设备相对地雷电冲击耐受电压的取值应为下列哪一项？
A.28KV
B.42kV
C.60KV
D.75Kv
未分类题
What can we learn about CEO's pay in 2011 from the passage?A.It continued its escalating trajectory.B.The median CEO pay was over $10 million.C.Many board members regarded CEO's pay moderatE.D.Board members took some measures to deal with CEO's high pay.
A.B.
B.
C.
C.
D.
D.
相关试题