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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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