12.用如图3 A 8所示的实验装置验证机械能守恒定律实验所用的电源为学生电源输出电压为6v的交流电和直流电两种重锤从高处由静止开始落下 Template




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tomski12.用如图3 a 8所示的实验装置验证机械能守恒定律实验所用的电源为学生电源输出电压为6v的交流电和直流电两种重锤从高处由静止开始落下 coloring