在天平左右两盘各放一只质量相等并盛有足量同浓度同体积稀盐酸的烧杯，天平平衡后往左盘烧杯中放入5g锌粒，右盘烧杯中放入5g铝片，反应结束后两托盘的位置A.仍保持平衡B.左盘高，右盘低C.左盘低，右盘高D.左右盘高低摆动不停
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C