習(xí)近平在慶祝中國共產(chǎn)黨成立100周年大會上發(fā)表重要講話
今天，慶祝中國共產(chǎn)黨成立100周年大會在北京天安門廣場隆重舉行，中共中央總書記、國家主席、中央軍委主席習(xí)近平發(fā)表重要講話。
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In recent years, the hygienic condition of dental unit waterline (DUWL) has gradually received attention in China. At the same time, many local standards have been introduced. For example, Beijing issued "DB11/T 1703- 2019 Technical Specifications for Waterway Disinfection of Oral Comprehensive Treatment Units" on December 25th, 2019, while Zhejiang Province issued "DB33/T 2307-2021 Technical Specifications for Cleaning and Disinfection of Dental Waterway Systems" on January 29, 2021. In fact, various countries in the world have begun to pay attention to issues related to waterway pollution in dental treatment units much earlier, and have made relevant specifications. This article summarizes the standards of various countries in this regard as follows: Foreign standards related to the waterway of dental treatment units In 1996, the American De...
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