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3 在图中,U=20V,R 1 =900Ω,R2=1100Ω。稳压二极管DZ的稳定电压U Z =10V,最大稳定电流I ZM =8mA。试求稳压二极管中通过的电流I Z 是否超过I ZM ?如果超过,怎么办?
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