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1. Implement the standard GB/T 12235-2007, JB/T 7746-2020
2. Structural Length Standard GB/T 12221-2005
3. Flange connection size standard GB/T 9113.1-2010, JB/T 82.1-82.4-2015
4. Inspection standard JB/T 9092-1999, GB/T 26480-2011
5. After passing the inspection, dry the water stains inside the cavity and cover both ends with dust caps
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