3036| 5
|
[一次接线] 世界上最早出现的接地系统是? |
| ||
点评
说明从“无”到“有”,对线路保护、人身安全的认识是渐进的。
| ||
| ||
|Archiver|手机版|小黑屋|《建筑电气》杂志官方论坛
( 蜀ICP备06020337号-1 )
GMT+8, 2025-5-29 21:27 , Processed in 0.075176 second(s), 30 queries .
Powered by Discuz! X3.5
© 2001-2025 Discuz! Team.