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1. In the process of movement and change of things, some features appear repeatedly many times, and the time taken for them to appear twice in a row is called "cycle". Periods are divided into mathematical cycles, chemical cycles, physical cycles, biological cycles, economic cycles and other types.国际知名合唱团指挥家严梓朗（刘德华饰），为帮助昔日恩师（卢冠廷饰）返回香港，带领一群因闯祸而被迫参加“热血合唱团试验计划”的“废柴”学生们，从零起步学习合唱。众人一起面对生活的挫折与挑战，最终在音乐中找回了自我，用歌声治愈人生的同时，严梓朗深藏在心底的秘密也逐步被揭开……《红皮鞋》讲述了为了自己的成功，不顾亲情，寻找爱情和欲望的无情的妈妈，和为了报复她陷入无法停止欲望束缚的女儿之间的故事。Medical history is more important than current medical history, flight accident symptoms and social adaptation. See Appendix A to GBL6408.3 for others.《爱是永恒》改编自法国作家艾莉丝费尼的小说，描述十九世纪末，正当双十年华的范伦婷爱上朱勒斯，两人决定共组美好家庭，却遇上世界大战爆发。The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.There are three main considerations for emergency response: