2.在用图实 6 7所示的实验装置来验证机械能守恒定律时某同学的以下说法中正确的是 图实 7 A.必须用秒表测出重物下落的时间 Template




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tomski2.在用图实 6 7所示的实验装置来验证机械能守恒定律时某同学的以下说法中正确的是 coloring