题目内容
由叶酸和（或）维生素B12缺乏所致的贫血是
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患儿，8个月，单纯母乳喂养，从未加辅食。近来，面色蜡黄，表情呆滞，舌面光滑，有轻微震颤，肝于肋下4cm。血常规：Hb90g/L，RBC2×1012/L，血清维生素B12降低。预防本病应重点强调
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