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将来食用盐应减少碘的含量。
Future table salt to be sprinkled with less iodine.
youdao
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方法用P P S法抽取451户居民食用盐，定量分析碘含量。
Methods Iodine salt from 451 households were selected by PPS method.
youdao
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方法用P P S法抽取451户居民食用盐，定量分析碘含量。
Methods Iodine salt from 451 households were selected by PPS method.
youdao