[img]file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Tencent/Users/490603173/QQ/WinTemp/RichOle/2V5UZV6TSFYDDH4A[7)PWHR.jpg[/img]
file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/Tencent/Users/490603173/QQ/WinTemp/RichOle/QN2T6J13)NF86BM)3F23Q`W.jpg
为什么说当开关断开时，D2导通，而且会将能量存储在电感中呢？
求解释~ |
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