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《乡村爱情进行曲》是“乡村爱情”系列剧的第九部。由企鹅影视、本山传媒联合出品，付滃、孟令宇执导，毕畅、贺树峰、唐鉴军、王小利、刘小光、赵本山等联合主演的农村题材剧。[1]A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the O-ring 10 is further arranged on the upper part of the packing assembly 9, the upper part of the O-ring 10 is provided with a packing gland 11, the valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, and the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41. The arcuate end face 12 forms a line seal between the sealing surface of the valve body 1 and the valve seat 7. The water grain 41 can ensure the sealing performance of the valve seat 7 and the valve disc 4.I waited quietly for a while. Zhao Mingkai recalled it and organized the language. Only then did he open his mouth and said:4: Fake fabrics are hard and really soft. This is the hard injury of fake fabrics, and so is NIKE elite socks.Action: Turn your hands around.9-8 Permissions: Write a class named Privileges that has only one attribute-Privileges, which stores the list of strings mentioned in Exercise 9-7. Move the method show_privileges () into this class. In the Admin class, a Privileges instance is used as its property. Create an Admin instance and use the method show_privileges () to display its permissions. ?