儿童龋病患病率居高不下 中国儿基会推进爱芽行动-大河网
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北京为 接诉即办 立法--法制网
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徐光启的成就：编制历法与翻译几何，提倡农学并提倡练兵_萧家老大_新浪博客
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北京集中销毁一批侵权假冒商品，近30吨货值380余万元
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