<bdo id="2fwpw"></bdo><noframes id="2fwpw"><delect id="2fwpw"></delect><delect id="2fwpw"></delect><noframes id="2fwpw"><rt id="2fwpw"></rt><bdo id="2fwpw"></bdo><delect id="2fwpw"></delect><delect id="2fwpw"><bdo id="2fwpw"></bdo></delect><noframes id="2fwpw"><noframes id="2fwpw"><delect id="2fwpw"><delect id="2fwpw"></delect></delect><rt id="2fwpw"></rt><delect id="2fwpw"></delect><delect id="2fwpw"></delect><bdo id="2fwpw"></bdo><bdo id="2fwpw"></bdo> <bdo id="2fwpw"><rt id="2fwpw"></rt></bdo><noframes id="2fwpw"><bdo id="2fwpw"></bdo><bdo id="2fwpw"></bdo><delect id="2fwpw"><rt id="2fwpw"></rt></delect><rt id="2fwpw"><rt id="2fwpw"></rt></rt><bdo id="2fwpw"><bdo id="2fwpw"></bdo></bdo><rt id="2fwpw"></rt><delect id="2fwpw"></delect><noframes id="2fwpw"><rt id="2fwpw"></rt><rt id="2fwpw"></rt><rt id="2fwpw"></rt><rt id="2fwpw"></rt><delect id="2fwpw"><noframes id="2fwpw"><noframes id="2fwpw"> <delect id="2fwpw"></delect><delect id="2fwpw"></delect><noframes id="2fwpw"><delect id="2fwpw"></delect><bdo id="2fwpw"></bdo><noframes id="2fwpw"><noframes id="2fwpw">
adidas
級別: 略有小成
精華主題: 0
發(fā)帖數量: 203 個(gè)
工控威望: 332 點(diǎn)
下載積分: 1383 分
在線(xiàn)時(shí)間: 303(小時(shí))
注冊時(shí)間: 2008-01-09
最后登錄: 2025-02-27
查看adidas的 主題 / 回貼
樓主  發(fā)表于: 2013-12-09 21:11
設備是三相五線(xiàn)制，但拉過(guò)來(lái)的供電電源是三相四線(xiàn)制(N和E在一起)，該怎么來(lái)接線(xiàn)呢？
etdssdabb
只有學(xué)而知之，沒(méi)有生而知之
級別: 家園�？�
精華主題: 0
發(fā)帖數量: 359 個(gè)
工控威望: 676 點(diǎn)
下載積分: 7861 分
在線(xiàn)時(shí)間: 231(小時(shí))
注冊時(shí)間: 2010-03-16
最后登錄: 2019-04-15
查看etdssdabb的 主題 / 回貼
1樓  發(fā)表于: 2013-12-10 12:52
三相四線(xiàn)和三相五線(xiàn)都統稱(chēng)TN系統，但它們又分TN-C也叫三相四線(xiàn)也叫保護接零。TN-S也叫三相五線(xiàn)和TN-C-S，三相四線(xiàn)中性線(xiàn)直接接地整個(gè)系統中有一部分中性線(xiàn)與保護零線(xiàn)是合一的，而末端是分開(kāi)的。你能否安TN-C-S去做。

国产精品碰碰现在自|超碰香蕉人人网99精品|人妻无码一区二区19p|久久久噜噜噜久久中文字幕|亚洲va中文字幕无码
<bdo id="2fwpw"></bdo><noframes id="2fwpw"><delect id="2fwpw"></delect><delect id="2fwpw"></delect><noframes id="2fwpw"><rt id="2fwpw"></rt><bdo id="2fwpw"></bdo><delect id="2fwpw"></delect><delect id="2fwpw"><bdo id="2fwpw"></bdo></delect><noframes id="2fwpw"><noframes id="2fwpw"><delect id="2fwpw"><delect id="2fwpw"></delect></delect><rt id="2fwpw"></rt><delect id="2fwpw"></delect><delect id="2fwpw"></delect><bdo id="2fwpw"></bdo><bdo id="2fwpw"></bdo> <bdo id="2fwpw"><rt id="2fwpw"></rt></bdo><noframes id="2fwpw"><bdo id="2fwpw"></bdo><bdo id="2fwpw"></bdo><delect id="2fwpw"><rt id="2fwpw"></rt></delect><rt id="2fwpw"><rt id="2fwpw"></rt></rt><bdo id="2fwpw"><bdo id="2fwpw"></bdo></bdo><rt id="2fwpw"></rt><delect id="2fwpw"></delect><noframes id="2fwpw"><rt id="2fwpw"></rt><rt id="2fwpw"></rt><rt id="2fwpw"></rt><rt id="2fwpw"></rt><delect id="2fwpw"><noframes id="2fwpw"><noframes id="2fwpw"> <delect id="2fwpw"></delect><delect id="2fwpw"></delect><noframes id="2fwpw"><delect id="2fwpw"></delect><bdo id="2fwpw"></bdo><noframes id="2fwpw"><noframes id="2fwpw">