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　　TF家族网剧《念念》启动开拍 敬请期待！Abstract factory mode refers to providing an interface to create a series of related or interdependent objects, so that clients can create product objects in multiple product families without specifying the specific type of products, emphasizing the change of "series objects". The main points of its implementation include: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.15.5 Night blindness treatment is ineffective and unqualified.她虽然嫁给尉缭，但是并未生育孩子，直到此时才发现做母亲是如此的艰难不易。(2) Electromagnetic time relay has short delay time (0.3 ~ 1.6 s), but its structure is relatively simple and is usually used in power failure delay occasions and DC circuits.