Sealed bidding. Inquiries on the website of Lu 'an Public Resources Trading Supervision Administration show that the staff also need to rest at night and seal the bid, and adopt overnight bid evaluation. In order to further improve the public resources trading service and optimize the functional layout of trading places, the available space of Huoqiu County Public Resources Trading Center in the government center lobby was rebuilt and expanded, and a rest room for overnight bid evaluation was set up. During the bid evaluation period, centralized and fully enclosed management will be implemented, and the whole audio and video monitoring system will be equipped to provide more perfect and thoughtful bidding services for bid evaluation experts.