常見(jiàn)例句This paper simply analyzes pulse generating circuit,pre amplifier,power amplifier through examples. 通過(guò)實(shí)例對(duì)脈沖發(fā)生、預(yù)放(驅(qū)動(dòng))、功放電路進(jìn)行了簡(jiǎn)要分析。I bought an amplifier yesterday. 我昨天買(mǎi)了一個(gè)擴(kuò)音器。pre amplifier 前置放大器Cook the pie for 20 minutes in a pre heated oven. 在經(jīng)過(guò)預(yù)熱的烤箱里烘烤餡餅20分鐘.The pre - christmas period be always very busy . 圣誕節(jié)前這一段時(shí)間總是很繁忙的。A gradual change in the output of a circuit or amplifier. 逐漸改變電路或放大器輸出功率的逐漸改變 返回 pre-amplifier