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V-grooves must be opened between the splicing boards. The V-grooves should be opened from both sides of the PCB. Under normal circumstances, the V-grooves should be opened by 1/3 on both sides of the PCB, i.e. If the thickness of the board is 1.6 mm, the depth of the V-grooves on both sides of the board should be 0.53 mm;;Encapsulate a request into an object so that you can parameterize customers with different requests. Queuing or logging requests and supporting undoable operations.花千骨，出生时命格诡异、坚强善良的孤女，被长留上仙白子画下凡化身墨冰仙所救，对他暗生情愫；白子画，身负重任一心想保护天下苍生的长留掌门，明知花千骨是自己生死劫，非但不忍杀生反救花千骨一命。所以救下小鱼儿后，苏樱便把小鱼儿关在这里。What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.Zetes24岁的埃伦总是很难完成她开始的工作，并最终决定获得她从未获得过的高中文凭。但要做到这一点，她必须假装自己16岁，这比她想象的要困难得多。