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认识化学元素 铜Cu 人类最早使用的金属 有意思的铜循环实验
铜是一种过渡元素，化学符号Cu，原子序数29。纯铜是柔软的金属，表面刚切开时为红橙色带金属光泽，单质呈紫红色。延展性好，导热性和导电性高
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