中国的三个缩写 PRC CHN CN，各用在什么场合或领域？ - 知乎 China's country code People's Republic of China's ISO 3166-1 alpha-3 and IOC country code Republic of China's IOC country code between 1932–1956, now TPE Canadian Health Network, a Canadian bilingual health promotion service Cultural Heritage Organization of Iran (CHN) CHN analyzer, can measure the elements carbon (C), hydrogen (H), and