如图所示为用打点计时器验证机械能守恒定律的实验装置关于这一实验下列说法正确的是 A.打点计时器应接直流电源b.实验时应先接通电源后 Template




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tomski如图所示为用打点计时器验证机械能守恒定律的实验装置关于这一实验下列说法正确的是 a.打点计时器应接直流电源b.实验时应先接通电源后 coloring