[問題] 基本電學
[問題] 應考資格、各種國考疑難雜症等,以有正確作法、答案者為主
(不包括書裡的疑問)。若問題如人生規劃、讀書計畫等,無一
定作法、答案者,請用閒聊選項。
請問這題該如何解?
http://i.imgur.com/NGW1tLQ.jpg

想了老半天還是想不出來怎麼解
腦筋不知道那裡卡住了
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