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最佳答案:My parents plan to take me to visit the capital of our great motherland. We'll g
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最佳答案:解题思路:根据T2~L图象比较出重力加速度的大小,因为北京和南京当地的重力加速度不同,从而可知北大的同学所测实验结果对应的图线.根据振动图象得出两摆的周期比,从
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最佳答案:The second we went to the Peking University ,where a professsor gave an introduc