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下列说法中不正确的是
①用稀盐酸清洗做焰色反应的金属铂丝
②医疗上可用碳酸钡作X射线透视肠胃的内服药
③水玻璃在建筑业用做粘合剂
④铝和铜具有良好的导电性,所以电工操作时,可把铜线和铝线绞接在一起
⑤氯化铵可用于金属的焊接上,以除去金属表面的氧化物薄膜
⑥医用酒精的质量分数为75%
⑦用新制备的Cu(OH)2悬浊液与病人尿液共热,可检验病人尿液中是否含有葡萄糖
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