如何用最简单的方法鉴别是不是纯银？

[[{"txt": "\u00a0 \u00a0\u00a0\u94f6\u5236\u9970\u54c1\u6309\u5176\u6210\u8272\uff0c\u4ece\u9ad8\u5230\u4f4e\u53ef\u5206\u4e3a\u7eaf\u94f6\u3001\u7eb9\u94f6\u548c\u8272\u94f6\u3002\u6309\u52a0\u5de5\u65b9\u5f0f\u53ef\u5206\u4e3a\u94f8\u9020\u94f6\u3001\u6253\u9020\u94f6\u548c\u94f6\u8272\u7ec6\u5de5\u5236\u54c1\u3002\u94f6\u5236\u9970\u54c1\u7684\u9274\u522b\u4e5f\u53ef\u91c7\u7528\u8bf8\u5982\u770b\u8272\u6cfd\u3001\u8bd5\u786c\u5ea6\u548c\u5f39\u529b\u3001\u6382\u91cd\u91cf\u3001\u542c\u97f3\u97f5\u3001\u8bd5\u5242\u70b9\u8bd5\u7b49\u65b9\u6cd5\u3002\u94f6\u8d28\u9970\u54c1\u6210\u8272\u572897\uff05\u4ee5\u4e0a\u7684\uff0c\u8868\u76ae\u6d01\u767d\u7ec6\u817b\uff0c\u5149\u6cfd\u67d4\u548c\u60a6\u76ee\uff1b\u6210\u8272\u8f83\u4f4e\u8005\u8868\u76ae\u989c\u8272\u9752\u767d\u6216\u7070\u767d\uff0c\u6709\u65f6\u5448\u9ec4\u3001\u9ed1\u7b49\u6742\u8272\uff0c\u8272\u6cfd\u660f\u6697\u65e0\u5149\u3002"}, {"img": "https://exp-picture.cdn.bcebos.com/ccc83ec5260f8835ec10846dce0788013970862d.m2m"}, {"txt": "\u00a0 \u00a0\u00a0\u94f6\u9996\u9970\u672c\u8eab\u7684\u53ef\u5851\u6027\u5f88\u5f3a\uff0c\u9020\u578b\u53d8\u5e7b\u591a\u6837\uff0c\u5df2\u7ecf\u4e0d\u518d\u662f\u6211\u4eec\u5370\u8c61\u4e2d\u5355\u7eaf\u7684\u7eaf\u94f6\u9996\u9970\u4e86\u3002\u5b83\u5728\u9020\u578b\u4e0a\u3001\u54c1\u79cd\u4e0a\u3001\u5de5\u827a\u4e0a\u90fd\u6709\u4e86\u4e0d\u5c11\u65f6\u5c1a\u7684\u5143\u7d20\uff0c\u800c\u4e14\u94f6\u9996\u9970\u7684\u9500\u552e\u91cf\u4e5f\u5728\u9010\u5e74\u6500\u5347\u3002"}, {"txt": "\u9664\u4e86\u6709\u7eaf\u94f6\u9996\u9970\u5916\uff0c\u8fd8\u6709\u9ed1\u94f6\u9996\u9970\u3001\u85cf\u94f6\u9996\u9970\u548c\u5f69\u94f6\u9996\u9970\u3002\u94f6\u9996\u9970\u7684\u8bf1\u4eba\u4e4b\u5904\u8fd8\u5728\u4e8e\u5b83\u53ef\u4ee5\u9576\u5d4c\u5b9d\u77f3\u6216\u4eff\u5b9d\u77f3\u7b49\u6750\u6599\uff0c\u4ece\u800c\u66f4\u52a0\u591a\u6837\u5316\u3002"}, {"txt": "\u00a0 \u00a0 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{"txt": "\u00a0 \u00a0 \u00a0\u94f6\u9996\u9970\u867d\u7136\u4e0d\u7b97\u8d35\u91cd\uff0c\u4f46\u4e5f\u6709\u771f\u6709\u5047\uff0c\u5c3d\u7ba1\u8fd9\u79cd\u73b0\u8c61\u4e0d\u662f\u666e\u904d\u5b58\u5728\uff0c\u4f46\u6d88\u8d39\u8005\u8fd8\u662f\u5e94\u8be5\u638c\u63e1\u4e00\u4e9b\u9274\u522b\u94f6\u9996\u9970\u7684\u65b9\u6cd5\u3002\u6d88\u8d39\u8005\u8d2d\u4e70\u7684\u65f6\u5019\u53ef\u4ee5\u901a\u8fc7\u94f6\u7684\u7269\u7406\u6027\u8d28\u8fdb\u884c\u68c0\u9a8c\uff0c\u901a\u5e38\u7528\u7684\u68c0\u9a8c\u65b9\u6cd5\u6709\uff1a"}, {"txt": "\u770b\u9996\u9970\u989c\u8272\uff1a\u7eaf\u5ea6\u6108\u9ad8\uff0c\u94f6\u8272\u6108\u6d01\u767d\uff0c\u9996\u9970\u8868\u9762\u770b\u4e0a\u53bb\u5747\u5300\u53d1\u4eae\uff0c\u6709\u6da6\u8272\u3002\u5982\u679c\u542b\u94c5\uff0c\u9996\u9970\u4f1a\u5448\u73b0\u51fa\u9752\u7070\u8272\uff1b\u5982\u542b\u94dc\uff0c\u9996\u9970\u8868\u9762\u4f1a\u663e\u5f97\u7c97\u7cd9\uff0c\u989c\u8272\u6ca1\u6709\u6da6\u6cfd\u611f\u3002"}, {"txt": "\u6382\u9996\u9970\u91cd\u91cf\uff1a\u767d\u94f6\u5bc6\u5ea6\u8f83\u4e00\u822c\u5e38\u89c1\u91d1\u5c5e\u7565\u5927\uff0c\u4e00\u822c\u5730\u8bb2\uff1a \u201c\u94dd\u8d28\u8f7b\u3001\u94f6\u8d28\u91cd\u3001\u94dc\u8d28\u4e0d\u8f7b\u53c8\u4e0d\u91cd\u3002\u201d\u56e0\u800c\u6382\u6382\u91cd\u91cf\u53ef\u5bf9\u5176\u662f\u5426\u4e3a\u767d\u94f6\u505a\u51fa\u521d\u6b65\u5224\u65ad\u3002\u82e5\u9970\u54c1\u4f53\u79ef\u8f83\u5927\u800c\u91cd\u91cf\u8f83\u8f7b\uff0c\u5219\u53ef\u521d\u6b65\u5224\u65ad\u8be5\u9970\u54c1\u5c5e\u5176\u5b83\u91d1\u5c5e\u3002"}, {"txt": "\u67e5\u786c\u5ea6\uff1a\u767d\u94f6\u786c\u5ea6\u8f83\u94dc\u4f4e\uff0c\u800c\u8f83\u94c5\u3001\u9521\u5927\uff0c\u53ef\u7528\u5927\u5934\u9488\u5212\u9996\u9970\u4e0d\u8d77\u773c\u7684\u5730\u65b9\u8fdb\u884c\u6d4b\u8bd5\uff0c\u5982\u9488\u5934\u6253\u6ed1\uff0c\u8868\u9762\u5f88\u96be\u7559\u4e0b\u75d5\u8ff9\uff0c\u5219\u53ef\u5224\u5b9a\u4e3a\u94dc\u8d28\u9996\u9970\u9970\u54c1\uff1b\u5982\u4e3a\u94c5\u3001\u9521\u8d28\u5730\uff0c\u5219\u75d5\u8ff9\u5f88\u660e\u663e\u3001\u7a81\u51fa\uff1b\u5982\u5b9e\u7269\u7559\u6709\u75d5\u8ff9\u800c\u53c8\u4e0d\u592a\u660e\u663e\uff0c\u4fbf\u53ef\u521d\u6b65\u5224\u5b9a\u4e3a\u767d\u94f6\u9996\u9970\u9970\u54c1\u3002"}, {"txt": "\u542c\u58f0\u97f5\uff1a\u7eaf\u94f6\u9996\u9970\u9970\u54c1\u63b7\u5730\u6709\u58f0\uff0c\u65e0\u5f39\u529b\uff0c\u58f0\u54cd\u4e3a 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{"txt": "925\u94f6\u9970\u7684\u9274\u522b"}, {"img": "https://exp-picture.cdn.bcebos.com/2947750192dd3340fe694c34881c99c0aefcf12d.m2m"}, {"txt": "\u7eaf\u94f6xiao\u77e5\u8bc6\uff0c\u5173\u4e8e925\u7eaf\u94f6"}, {"txt": "\u00a0 \u00a0\u94f6\u662fK\u91d1\u9996\u9970\u4e2d\u4e0d\u53ef\u7f3a\u5c11\u7684\u7ec4\u5408\u91d1\u5c5e\uff0c\u4f46\u505a\u4e3a\u4ee5\u94f6\u4e3a\u4e3b\u7684\u9996\u9970\uff0c\u4e3b\u8981\u662f\u9ad8\u7eaf\u5ea6\u7684\u201c\u6807\u51c6\u94f6\u201d\u4e00\u79cd\u3002"}, {"txt": "\u94f6\u7684\u786c\u5ea6\u4e3a2.7\uff0c\u4e3a\u4e86\u63d0\u9ad8\u5176\u786c\u5ea6\u548c\u83b7\u53d6\u6700\u4f73\u7684\u6210\u578b\u6548\u679c\uff0c\u5728\u505a\u9996\u9970\u65f6\u9700\u8981\u5728\u94f6\u4e2d\u52a0\u51657.5\uff05\u7684\u94dc\u3002\u8fd9\u79cd\u542b\u94f692.5\uff05\u3001\u542b\u94dc7.5\uff05\u7684\u5408\u91d1\uff0c\u56fd\u9645\u4e0a\u79f0\u4e3a\u6807\u51c6\u94f6\u3002\u5728\u82f1\u56fd\u4e5f\u79f0\u4e3a\u82f1\u9551\u94f6\uff08Sterling\uff09\u3002\u6b64\u5916\uff0c\u5e02\u573a\u4e0a\u8fd8\u6709\u94f6\u542b\u91cf99\uff05\u7684\u8db3\u94f6\u9970\u54c1\u3002"}, {"txt": 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"1\uff09\u5370\u8bb0\u3002\u94f6\u9996\u9970\u4e00\u822c\u5e94\u6253\u4e0a\u94f6\u7684\u82f1\u6587\u7f29\u5199\uff08\u201cS\u201d\u6216\u201cSterling\u201d\uff09\u7684\u5370\u8bb0\u3002\u6807\u51c6\u94f6\u7684\u5370\u8bb0\u662fS925\u3002\u8db3\u94f6\u7684\u5370\u8bb0\u662fS990\u3002\u4f46\u4e5f\u6709\u8bb8\u591a\u56fd\u5bb6\u5728\u94f6\u9996\u9970\u4e0a\u4e0d\u6253\u5370\u8bb0\u3002"}, {"txt": "2\uff09\u8272\u6cfd\u3002\u94f6\u9996\u9970\u591a\u5448\u5fae\u5e26\u9ec4\u7684\u94f6\u767d\u8272\uff0c\u5448\u67d4\u548c\u7684\u91d1\u5c5e\u5149\u6cfd\u3002\u56e0\u6613\u6c27\u5316\uff0c\u65f6\u95f4\u4e45\u4e86\uff0c\u8272\u6cfd\u4f1a\u53d8\u6210\u6697\u7684\u9ec4\u767d\u8272\u3002"}, {"txt": "3\uff09\u6382\u91cd\u3002\u94f6\u7684\u5bc6\u5ea6\u4e3a 10.53\u514b\uff0f\u7acb\u65b9\u5398\u7c73\u3002\u6bd4\u94c2\u91d1\u3001\u9ec4\u91d1\u5c0f\uff0c\u7528\u624b\u6382\u65e0\u5760\u624b\u611f\u3002\u94a2\u9488\u53ef\u4ee5\u5212\u51fa\u75d5\u8ff9\uff0c\u4e5f\u53ef\u4ee5\u6298\u5f2f\u3002\u7528\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u548c\u94c2\u4e3b\u3001K\u767d\u91d1\u6216\u4eff\u94f6\u7684\u5fb7\u94f6\u9996\u9970\u76f8\u533a\u522b\u3002"}, {"txt": "4\uff09\u9178\u8bd5\u3002\u94f6\u9047\u4efb\u4f55\u9178\u90fd\u4f1a\u53d8\u8272\uff0c\u751a\u81f3\u6eb6\u89e3\u3002\u5982\u679c\u5728\u94f6\u9996\u9970\u7684\u5185\u4fa7\u6ef4\u4e0a\u4e00\u6ef4\u6d53\u76d0\u9178\uff0c\u4f1a\u7acb\u5373\u751f\u6210\u767d\u8272\u82d4\u85d3\u72b6\u7684\u6c2f\u5316\u94f6\u6c89\u6dc0\u3002\u800c\u5176\u5b83\u8d35\u91d1\u5c5e\u5219\u65e0\u6b64\u73b0\u8c61\u3002"}, {"txt": "5\uff09\u58f0\u97f5\u3002\u6807\u51c6\u94f6\u9996\u9970\u843d\u5730\u540e\u58f0\u97f3\u6c89\u95f7\uff0c\u4e0d\u5f39\u8df3\uff0c\u4e0d\u6eda\u52a8\u3002"}, {"txt": "\u94f6\u9970\u54c1\u7684\u4fdd\u517b"}, {"txt": 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