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Trace element Zn in 86 children was determined and investigated.
对86例儿童微量元素锌水平进行了调查研究。
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Radon: Chemical element, chemical symbol Rn, atomic number 86.
氡：化学元素，化学符号Rn，原子序数86。
youdao
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Radon: Chemical element, chemical symbol Rn, atomic number 86.
氡：化学元素，化学符号Rn，原子序数86。
youdao