题目内容

锗二极管的导通电压____,死区电压____。

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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

Which is the effect of Water Pollution?

A.Cause people to get sick
B.Kill animals and plants
C.Produce acid rain
D.Pollute soil and groundwater

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