题目内容

二极管的正向电阻于____;反向电阻____。

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锗二极管的导通电压____,死区电压____。

硅二极管的导通电压____,死区电压____。

稳压二极管需要串入____才能正常工作。

Which is the source of Water Pollution?

A.Waste gases from automobiles
B.Emissions of harmful gases from factories
C.Waste materials from homes and industries dumped in landfills
D.Garbage dumped into the sea

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