【单选题】【消耗次数：1】
电流的四大效应包括：热效应、（）、光电效应以及电流化学效应。
①
导电效应
②
磁效应
③
电功效应
④
高压效应
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当一束光照射某金属时，未出现光电效应。欲使该使金属产生光电效应，则应（）
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