Urumqi's bid in 2022 can't recommend brands. The manufacturer and brand of main building materials cannot be stated in the tender documents, otherwise it is illegal. According to the relevant provisions of China laws and regulations, the tender documents shall not require or indicate specific producers and suppliers or contain other contents that tend to or exclude potential bidders. Restricting or designating a specific patent, trademark, brand, country of origin or supplier means restricting or excluding potential bidders or bidders with unreasonable conditions.