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The design of PCB has always required that boards be distributed according to functional zones. In order to facilitate production inspection and maintenance, it is also necessary to define component numbers according to functional zones. The following component bit number partition definition rules are proposed for three-phase meters and end products:On April 22, 2016, the State Administration of Press, Publication, Radio, Film and Television publicly announced the investigation of 15 media outlets, including Caijing magazine WeChat Public Number, for publishing false and untrue reports. Pointed out that:【续订】CBS正式公布秋季档续订名单Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.