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The first type is implemented through the relationship between the parent class and the child class.星光灿烂剧照(10张)此剧讲述两个家族间的秘密与恶缘解开后，成为真正的家人的故事。该剧根据DC的“蝙蝠侠”系列漫画改编，以全新的视角讲述作为年轻警探的詹姆斯·戈登试图与哥谭市的犯罪腐败势力抗争，并逐步与年轻的亿万富翁、幼年的蝙蝠侠布鲁斯·韦恩建立信任关系的故事。A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, A valve seat 7 is arranged between the valve disc 4 and the guide sleeve 6, a packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, an 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.In summer, they fight like children in the yard.