性无码一区二区三区在线观看,少妇被爽到高潮在线观看,午夜精品一区二区三区,无码中文字幕人妻在线一区二区三区,无码精品国产一区二区三区免费

  • 回復(fù)
  • 收藏
  • 點(diǎn)贊
  • 分享
  • 發(fā)新帖

開(kāi)關(guān)電源雙面板

請(qǐng)教:開(kāi)關(guān)電源的雙面板中,地線(xiàn)走TOPLAYER好,還是走BOTTOMLAYER好?
全部回復(fù)(6)
正序查看
倒序查看
jacki_wang
LV.11
2
2006-03-01 09:10
基本上走BOTTOMLAYER的話(huà)比較有機(jī)會(huì)加裸銅.
0
回復(fù)
winfrey1
LV.6
3
2006-05-12 21:07
@jacki_wang
基本上走BOTTOMLAYER的話(huà)比較有機(jī)會(huì)加裸銅.
Wang'R ,What's the function of the bare copper foil?
3x
0
回復(fù)
jacki_wang
LV.11
4
2006-05-12 21:21
@winfrey1
Wang'R,What'sthefunctionofthebarecopperfoil?3x
tin the bare copper foil to reduce DC resistance and decrease the trace loss.
0
回復(fù)
winfrey1
LV.6
5
2006-05-12 21:32
@jacki_wang
tinthebarecopperfoiltoreduceDCresistanceanddecreasethetraceloss.
i see, 3x, it's said that tin has a poor conductivity than copper does.
0
回復(fù)
jacki_wang
LV.11
6
2006-05-12 21:46
@winfrey1
isee,3x,it'ssaidthattinhasapoorconductivitythancopperdoes.
Yes, u a right, but it should be better with tin.
0
回復(fù)
李紹波
LV.9
7
2006-07-26 11:35
暈死,,,,全是說(shuō)英文的
0
回復(fù)
立
即
發(fā)
帖