当PN结外加反向电压时,扩散电流 ( )漂移电流。
PN结反向偏置时,外加电压形成的外电场的方向和PN结内电场方向相反,相当于削弱了内电场。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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