In fact, the state has never classified publications, that is, there is no difference between national and provincial levels in professionalism and influence. The so-called distinction between provincial periodicals and national periodicals is mainly for the convenience of management, according to the level of periodical authorities. That is, the periodicals in charge of state units are national periodicals, and the periodicals in charge of provincial units are provincial periodicals. However, whether it is a national periodical or a provincial periodical, there must be a CN number and an ISSN number. "CN" refers to the unified serial publication number in China, that is, the code assigned to serial publications by the administrative department of press and publication; "ISSN number" refers to the standard international serial publication number, which is the abbreviation of the standard international serial publication number. Most periodicals in China are equipped with ISSN number.
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