[問題] 自來水有偏壓?
用數位三用電表
把探針直接插入水裡直接測直流電壓
居然顯示有偏壓!? 大約0.04 V
(就單純只是一杯用玻璃杯裝的自來水)
用藥用酒精(95%)測試也有類似的結果
請問實驗的專家 這是怎麼回事?
我跟同學的電表比較過 結果一樣
這是電表的問題嗎?
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