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What should be the beginning of the house number on the ninth floor?
The house number on the 9th floor of Building 9 should start with 90.

The "doorplate" is a collection of famous temple buildings distributed in Beijing, Anhui, Shanghai, Chengdu, Wuhan, Guangzhou, Taiwan Province and other places, or old houses with traces of time, or middle schools, university campuses that left a deep impression in their youth, or theater houses that accompanied them in their growing years. The content is informative and vivid, or emotional, or unbearable, and very infectious.