The plate with the word "Central Plains" on the low plate is the plate with dragons on the low plate in which dynasty?

Lying like a dragon's plate. Describe the majestic appearance. Tang Li Bai's "Jinling Song Farewell to Fan Xuan": "The dragon comes from Zhongshan, and the beauty is divided into Liyang trees." Xu Ming wrote "The Story of Picking a Shuttle": "Wang Qi is long and flat, and he chooses half a river, which means that Jiangdong has to pay Japanese money." Chen Qubing's poem "Sleeping in Zhangjiakou and Looking at the Bright Moon": "There is a long bridge outside the door, winding like a dragon." See "Dragon Pan Tiger Ju".

Describe the flying and vigorous calligraphy. "The Biography of Wang Jinshu's Xi": "The smoke is about to drip, and if it is broken, it will pass; The phoenix is like a dragon, and the trend is oblique and straight. "