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关于阻焊层
2008-8-3 12:30
- PCB技术
- 8
- 1446
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
请大家帮忙看一下这电路中三极管的作用,原理
2008-4-3 22:32
- 电路赏析
- 28
- 5117
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
请问在Protel PCB制图中如何画一个椭圆?
2008-2-28 16:20
- 电路赏析
- 18
- 6418
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
protel99SE如何放置mark点
2008-8-1 11:15
- PCB技术
- 2
- 5846
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
超级愚昧:多谐振荡器产生方波?!
2008-2-27 14:18
- 电路赏析
- 6
- 2328
![](https://bbs.21ic.com/static/image/common/icon_quote_m_s.gif)
![](https://bbs.21ic.com/static/image/common/icon_quote_m_e.gif)
2
3
近期访客