電路設(shè)計(jì),根據(jù)要求設(shè)計(jì)一款電路并進(jìn)行參數(shù)計(jì)算。 設(shè)計(jì)一款線性直流穩(wěn)壓電源電路,要求可以輸出正負(fù)12V雙電源。正負(fù)電源最大工作電流分別可以達(dá)到800毫安。正負(fù)電源分別有電源指示燈（）該電路在進(jìn)行PCB圖設(shè)計(jì)時(shí),應(yīng)該注意哪些注意事項(xiàng)？
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Tom turned round from time to time,s if______for someone in the crowd.serchingB．sercTom turned round from time to time,s if______for someone in the crowd.serching B．serched C．to serch D．to hve
Tom turned round from time to time,s if______for someone in the crowd.serchingB．sercTom turned round from time to time,s if______for someone in the crowd.serching B．serched C．to serch D．to hve
A．searchingB．searchedC．to searchD．to have