【单选题】【消耗次数：1】
为使三极管工作在放大状态，必须
①
发射结和集电结加反向偏置
②
发射结和集电结加正向偏置
③
发射结加正向偏置，集电结加反向偏置
④
发射结加反向偏置，集电结加正向偏置
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