Unverified90% confidenceDecision RuleTime unknown
食品级柠檬酸纯度应≥99.5%（无水柠檬酸），认准包装标注GB 1886.235或FCC食品级标准，工业级柠檬酸可能含重金属杂质不可用于接触入口器具
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Unverified除垢剂用量按内胆容积计算：柠檬酸类通常每50L水箱需250-300g，浓度约5-8%，浓度过低垢化不彻底，过高对镁棒和加热管密封圈有额外腐蚀72% similarUnverified认准瓶身标注酸度（游离酸度）≤0.8%才是特级初榨（Extra Virgin）标准，优质礼盒级产品酸度多在0.2%-0.4%，数值越低说明果实越新鲜、压榨越及时70% similarUnverified特级初榨橄榄油（Extra Virgin）酸度必须≤0.8g/100g，购买时认准瓶身标注的具体酸度值，优质产品通常在0.2-0.4之间，酸度越低鲜果度越高67% similarUnverified选特级初榨（Extra Virgin）需认准酸度≤0.8%，优质产品酸度多在0.2-0.4%，酸度越低游离脂肪酸越少、越新鲜，礼盒装应看瓶身或说明书标注66% similarUnverified山西老陈醋的'陈酿年份'标注需谨慎：包装标'三年陈''五年陈'不等于全部醋液陈酿该年限，可能是勾兑少量老醋，认准企业标准和总酸/不挥发酸比例更可靠（不挥发酸≥1.3g/100ml为佳）64% similar
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