如图是握力计的原理图其中弹簧上端和�动变阻器的�片固定在一起ab间有可收缩的导线r是保护电阻.当电压表示数变大时说明作用在ab间的握力 Template




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tomski如图是握力计的原理图其中弹簧上端和�动变阻器的�片固定在一起ab间有可收缩的导线r是保护电阻.当电压表示数变大时说明作用在ab间的握力 coloring