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The technical scheme further optimized by the utility model is that the filler assembly 9 comprises a graphite packing filler layer. The packing assembly 9 is secured by an O-ring 10 and a packing gland 11.　　好一出隋唐演义，义气、情意、爱情，权谋、圈套与征伐，千古流传，荡气回肠…位于圣丹尼斯的一所学校的日常生活。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 is something to say to Tou Jun: the 10-month payment plan is indeed much more acceptable to investors than the 2-year and 3-year payment, and the platform's reneging face is really disgusting!3. Count; Ordinary users can get the discount coupon if there is a number of lottery tickets, otherwise, they cannot get the discount coupon.(3) A taillight.