INE: https://www.ine.com.cn/eng/services/trading/accountopening/
SHFE：https://www.shfe.com.cn/eng/services/trading/AccountOpening/
DCE: http://www.dce.com.cn/dceg/file/2025-05-25/1748164796190ff8080819701ddb3256019706bddf1e20ea.pdf
