1如图1是通过重物自由下落的实验验证机械能守恒定律.关于本实验下列说法正确的是bcbca.从实验装置看该实验可用4 6伏的直流电源b.用 Template




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tomski1如图1是通过重物自由下落的实验验证机械能守恒定律.关于本实验下列说法正确的是bcbca.从实验装置看该实验可用4 6伏的直流电源b.用 coloring