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你好!很高兴你解答我的问题。是我犯了个错误,测输出电压时万用表的红表笔和黑表笔的测试距离太远,黑表笔接到负载的一端通过线连接到板子的地上,而这短线上在输出满载时有0.1V的压降,而我的精度就差这0.1V,后来将黑表笔接到板子的地上就对了。