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Visitor mode is to encapsulate some operations applied to a certain data structure. Once these operations need to be modified, the data structure that accepts this operation can be saved unchanged. Visitor mode is suitable for systems with relatively stable data structures. It reduces the coupling degree between data structures and operations acting on data structures, making the set of operations relatively free to change. The specific structure diagram is as follows:Article 56 Social organizations that have been engaged in social fire fighting technical service activities before the implementation of these Provisions shall apply for corresponding qualifications in accordance with the conditions and procedures of these Provisions within six months from the date of implementation of these Provisions. Those who fail to apply within the time limit or continue to engage in social fire fighting technical service activities after examination or examination shall be punished in accordance with the provisions of Article 46 of these Provisions and shall be announced to the public.5. The lights and types specified in the terms of these Rules shall conform to the provisions of Appendix I to these Rules.Household machine:杨长帆也马不停蹄，趁热打铁，在绍兴牢中指导何永强写下了认罪书，当日下午便送与赵文华胡宗宪过目。背负着杀了自己母亲的罪名且被夺走一切的女人堂堂正正地对抗现实并查明真相找到幸福的故事。两个老婆子听了，老脸乐成一朵菊花，口内不住谦虚。