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妊娠期间,哪些微量元素需要补充?哪些微量元素不需要额外补充?哪些微量元素在补充时还要同时补充维生素D?哪些微量元素要严格掌握剂量?
During pregnancy, which trace elements need to be supplemented? What trace elements do not need additional supplements? Which trace elements in the supplement but also to add vitamin D? Which trace elements to strictly control the dose?