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Secondly, it is suggested that if the feedback of the problem is not implemented according to the requirements determined by the discussion, the responsible person or the competent leader of the department concerned should implement the accountability system in addition to the performance appraisal.Li Yifeng! ! ! ! ! ! ! ! !The scenarios used in the command mode include: sometimes it is necessary to send a request to some objects, but I don't know who the recipient of the request is or what the operation of the request is. At this time, I hope to design the program code in a loosely coupled way; So that the request sender and the request receiver eliminate the coupling relationship in each other's codes.珍爱的传家古董如有破损，损失的远不仅仅是金钱，更重要的是对先祖对家人的怀念。英国乡间的修理店修补古老物件，每件旧物后面都有一个感人的亲情故事。Before learning Reactor mode, we need to briefly introduce "four models of I/O" and "what is I/O multiplexing", because Reactor is a mode that uses synchronous non-blocking I/O multiplexing mechanism.世伯心系国防，侄儿佩服。16. Iterator)