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【简答题】
Each type of multimeter has its advantages. Used as a voltmeter, 1 multimeteris usually better because its resistance is much higher, 1 Mega-ohm or 10 Mega-ohm, compared to 200 kilo ohm for 2 multi-meter on a similar range. On the other hand,it is easier to fllow a slowly changing voltage by watching the needle on 3 display :
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