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Disadvantages: The efficiency is a bit low, and the synchronization lock must be judged every time the instance is called.故事发生在英勇的骑士、美丽的公主和与巫师战斗的时代。流浪艺术家鲁斯兰梦想成为一名骑士，偶遇了美丽的公主米拉并坠入爱河，他们在城堡外度过了美妙的时光。然而，幸福并没有持续太久，邪恶的魔法师切诺莫为了达成阴谋，在鲁斯兰的眼前用魔法漩涡劫走了米拉。慌乱之后，鲁斯兰开始试图穿越魔法森林寻找公主，经过一系列奇妙生物的“助攻”后克服了重重障碍，最终战胜了邪恶魔法，与公主幸福的生活在一起。Just pass the request to the first node.2.1. 2 Minimum PCB sizeThe second scenario uses the proxy pattern, Among them, the myImage function is only responsible for doing one thing, creating IMG elements and adding them to the page. The loading picture is given to the proxy function ProxyImage to do. When the picture is loaded successfully, the proxy function ProxyImage will notify and execute the method of the myImage function. At the same time, when the proxy object is not needed in the future, we can directly call the method of the ontology object.What is NBA:Wang Bo explained that online marketing pays attention to "planting grass and pulling grass", storing water, and then detonating at a certain point in time, but offline consumers cannot afford to wait, nor can stores. Therefore, when resonating online and offline, activities should be increased according to offline characteristics to maintain heat.